646164256 has 12 divisors (see below), whose sum is σ = 1272135942. Its totient is φ = 323082112.

The previous prime is 646164227. The next prime is 646164257. The reversal of 646164256 is 652461646.

It can be written as a sum of positive squares in only one way, i.e., 610880656 + 35283600 = 24716^2 + 5940^2 .

It is not an unprimeable number, because it can be changed into a prime (646164257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096285 + ... + 10096348.

Almost surely, 2^646164256 is an apocalyptic number.

It is an amenable number.

646164256 is a deficient number, since it is larger than the sum of its proper divisors (625971686).

646164256 is a wasteful number, since it uses less digits than its factorization.

646164256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20192643 (or 20192635 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 646164256 is about 25419.7611318439. The cubic root of 646164256 is about 864.5318085113.

The spelling of 646164256 in words is "six hundred forty-six million, one hundred sixty-four thousand, two hundred fifty-six".