646311556 has 24 divisors (see below), whose sum is σ = 1243297440. Its totient is φ = 291532800.

The previous prime is 646311551. The next prime is 646311557. The reversal of 646311556 is 655113646.

It is a super-2 number, since 2×646311556² = 835437254838282272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646311551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50301 + ... + 61828.

It is an arithmetic number, because the mean of its divisors is an integer number (51804060).

Almost surely, 2^646311556 is an apocalyptic number.

It is an amenable number.

646311556 is a deficient number, since it is larger than the sum of its proper divisors (596985884).

646311556 is a wasteful number, since it uses less digits than its factorization.

646311556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112275 (or 112273 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 646311556 is about 25422.6583189091. The cubic root of 646311556 is about 864.5974965872.

The spelling of 646311556 in words is "six hundred forty-six million, three hundred eleven thousand, five hundred fifty-six".