The krafft temperature (Tk) of sodium tetradecyl sulfate (STS) has been determined conductometrically in aqueous, different aquo-organic solvent media (dioxane, formamide, and ethylene glycol), different concentrations of additives viz. NaCl, β-CD, and octadecyltrimethylammonium bromide (OTAB). The change in Tk in different media has been notified and summarized in tabular form. The micellar properties of STS also have been determined in binary aqueous mixtures of dioxane (DO) and formamide (FA) by tensiometry, conductometry and isothermal titration calorimetry. Different interfacial parameters, Gibbs surface excess (Γmax), area minima per surfactant (Amin), surface pressure (ΠCMC), and packing parameter (P) have been calculated from related well-known equations. Thermodynamic parameters, such as free energy for micellization (ΔGm0), free energy of adsorption (ΔGads0), change in enthalpy (ΔHm0), and entropy change associated with micellization (ΔSm0) have been also deduced. Aggregation number and Stern Volmer constant of STS in DO and FA have been determined from steady state fluorescence quenching study using fluorimetric technique.