646806568 has 16 divisors (see below), whose sum is σ = 1251884160. Its totient is φ = 312970800.

The previous prime is 646806553. The next prime is 646806581. The reversal of 646806568 is 865608646.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303798 + ... + 1304293.

It is an arithmetic number, because the mean of its divisors is an integer number (78242760).

Almost surely, 2^646806568 is an apocalyptic number.

It is an amenable number.

646806568 is a deficient number, since it is larger than the sum of its proper divisors (605077592).

646806568 is a wasteful number, since it uses less digits than its factorization.

646806568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608128 (or 2608124 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The square root of 646806568 is about 25432.3921014127. The cubic root of 646806568 is about 864.8181728814.

The spelling of 646806568 in words is "six hundred forty-six million, eight hundred six thousand, five hundred sixty-eight".