166685057 has 16 divisors (see below), whose sum is σ = 209665152. Its totient is φ = 128728320.

The previous prime is 166685039. The next prime is 166685059. The reversal of 166685057 is 750586661.

It is not a de Polignac number, because 166685057 - 2⁸ = 166684801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166684999 and 166685017.

It is not an unprimeable number, because it can be changed into a prime (166685059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 878 + ... + 18279.

It is an arithmetic number, because the mean of its divisors is an integer number (13104072).

Almost surely, 2^166685057 is an apocalyptic number.

It is an amenable number.

166685057 is a deficient number, since it is larger than the sum of its proper divisors (42980095).

166685057 is a wasteful number, since it uses less digits than its factorization.

166685057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19288.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 166685057 is about 12910.6567222586. The cubic root of 166685057 is about 550.3414485856.

The spelling of 166685057 in words is "one hundred sixty-six million, six hundred eighty-five thousand, fifty-seven".