164555657 has 32 divisors (see below), whose sum is σ = 203980800. Its totient is φ = 129729600.

The previous prime is 164555653. The next prime is 164555659. The reversal of 164555657 is 756555461.

It is not a de Polignac number, because 164555657 - 2² = 164555653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164555653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496982 + ... + 497312.

It is an arithmetic number, because the mean of its divisors is an integer number (6374400).

Almost surely, 2^164555657 is an apocalyptic number.

It is an amenable number.

164555657 is a deficient number, since it is larger than the sum of its proper divisors (39425143).

164555657 is a wasteful number, since it uses less digits than its factorization.

164555657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477.

The product of its digits is 630000, while the sum is 44.

The square root of 164555657 is about 12827.9248906438. The cubic root of 164555657 is about 547.9878620307.

The spelling of 164555657 in words is "one hundred sixty-four million, five hundred fifty-five thousand, six hundred fifty-seven".