164661657 has 16 divisors (see below), whose sum is σ = 232216320. Its totient is φ = 103496400.

The previous prime is 164661641. The next prime is 164661661. The reversal of 164661657 is 756166461.

It is a happy number.

It is not a de Polignac number, because 164661657 - 2⁴ = 164661641 is a prime.

It is a super-2 number, since 2×164661657² = 54226922571971298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (164661667) 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, 5182 + ... + 18872.

It is an arithmetic number, because the mean of its divisors is an integer number (14513520).

Almost surely, 2^164661657 is an apocalyptic number.

It is an amenable number.

164661657 is a deficient number, since it is larger than the sum of its proper divisors (67554663).

164661657 is a wasteful number, since it uses less digits than its factorization.

164661657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13924.

The product of its digits is 181440, while the sum is 42.

The square root of 164661657 is about 12832.0558368486. The cubic root of 164661657 is about 548.1055005378.

The spelling of 164661657 in words is "one hundred sixty-four million, six hundred sixty-one thousand, six hundred fifty-seven".