646507168 has 12 divisors (see below), whose sum is σ = 1272811050. Its totient is φ = 323253568.

The previous prime is 646507159. The next prime is 646507171. The reversal of 646507168 is 861705646.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 640494864 + 6012304 = 25308^2 + 2452^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101643 + ... + 10101706.

Almost surely, 2^646507168 is an apocalyptic number.

It is an amenable number.

646507168 is a deficient number, since it is larger than the sum of its proper divisors (626303882).

646507168 is a wasteful number, since it uses less digits than its factorization.

646507168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20203359 (or 20203351 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 646507168 is about 25426.5052258465. The cubic root of 646507168 is about 864.6847138559.

The spelling of 646507168 in words is "six hundred forty-six million, five hundred seven thousand, one hundred sixty-eight".