646156132 has 6 divisors (see below), whose sum is σ = 1130773238. Its totient is φ = 323078064.

The previous prime is 646156129. The next prime is 646156139. The reversal of 646156132 is 231651646.

It can be written as a sum of positive squares in only one way, i.e., 453945636 + 192210496 = 21306^2 + 13864^2 .

It is not an unprimeable number, because it can be changed into a prime (646156139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80769513 + ... + 80769520.

Almost surely, 2^646156132 is an apocalyptic number.

It is an amenable number.

646156132 is a deficient number, since it is larger than the sum of its proper divisors (484617106).

646156132 is a wasteful number, since it uses less digits than its factorization.

646156132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161539037 (or 161539035 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 646156132 is about 25419.6013344033. The cubic root of 646156132 is about 864.5281853429.

The spelling of 646156132 in words is "six hundred forty-six million, one hundred fifty-six thousand, one hundred thirty-two".