166372057 has 4 divisors (see below), whose sum is σ = 169911936. Its totient is φ = 162832180.

The previous prime is 166372039. The next prime is 166372069. The reversal of 166372057 is 750273661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 750273661 = 487 ⋅1540603.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166372057 is a prime.

It is a super-2 number, since 2×166372057² = 55359322700822498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166372007) 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, 1769869 + ... + 1769962.

It is an arithmetic number, because the mean of its divisors is an integer number (42477984).

Almost surely, 2^166372057 is an apocalyptic number.

It is an amenable number.

166372057 is a deficient number, since it is larger than the sum of its proper divisors (3539879).

166372057 is an equidigital number, since it uses as much as digits as its factorization.

166372057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539878.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 166372057 is about 12898.5292572448. The cubic root of 166372057 is about 549.9967570057.

The spelling of 166372057 in words is "one hundred sixty-six million, three hundred seventy-two thousand, fifty-seven".