166915057 has 4 divisors (see below), whose sum is σ = 175700080. Its totient is φ = 158130036.

The previous prime is 166915051. The next prime is 166915069. The reversal of 166915057 is 750519661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166915057 - 2¹⁹ = 166390769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166915051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4392483 + ... + 4392520.

It is an arithmetic number, because the mean of its divisors is an integer number (43925020).

Almost surely, 2^166915057 is an apocalyptic number.

It is an amenable number.

166915057 is a deficient number, since it is larger than the sum of its proper divisors (8785023).

166915057 is an equidigital number, since it uses as much as digits as its factorization.

166915057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8785022.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 166915057 is about 12919.5610219543. The cubic root of 166915057 is about 550.5944613838.

The spelling of 166915057 in words is "one hundred sixty-six million, nine hundred fifteen thousand, fifty-seven".