166478539 has 2 divisors, whose sum is σ = 166478540. Its totient is φ = 166478538.

The previous prime is 166478527. The next prime is 166478549. The reversal of 166478539 is 935874661.

166478539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166478539 - 2¹³ = 166470347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166478492 and 166478501.

It is not a weakly prime, because it can be changed into another prime (166478549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83239269 + 83239270.

It is an arithmetic number, because the mean of its divisors is an integer number (83239270).

Almost surely, 2^166478539 is an apocalyptic number.

166478539 is a deficient number, since it is larger than the sum of its proper divisors (1).

166478539 is an equidigital number, since it uses as much as digits as its factorization.

166478539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The square root of 166478539 is about 12902.6562769067. The cubic root of 166478539 is about 550.1140689027.

The spelling of 166478539 in words is "one hundred sixty-six million, four hundred seventy-eight thousand, five hundred thirty-nine".