166140657 has 12 divisors (see below), whose sum is σ = 242358324. Its totient is φ = 109663200.

The previous prime is 166140647. The next prime is 166140659. The reversal of 166140657 is 756041661.

It can be written as a sum of positive squares in 2 ways, for example, as 156350016 + 9790641 = 12504^2 + 3129^2 .

It is not a de Polignac number, because 166140657 - 2⁴ = 166140641 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166140659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90478 + ... + 92295.

It is an arithmetic number, because the mean of its divisors is an integer number (20196527).

Almost surely, 2^166140657 is an apocalyptic number.

It is an amenable number.

166140657 is a deficient number, since it is larger than the sum of its proper divisors (76217667).

166140657 is a wasteful number, since it uses less digits than its factorization.

166140657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182880 (or 182877 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 166140657 is about 12889.5561211393. The cubic root of 166140657 is about 549.7416494634.

The spelling of 166140657 in words is "one hundred sixty-six million, one hundred forty thousand, six hundred fifty-seven".