646391064525 has 12 divisors (see below), whose sum is σ = 1068699893472. Its totient is φ = 344741901040.

The previous prime is 646391064503. The next prime is 646391064589. The reversal of 646391064525 is 525460193646.

It is not a de Polignac number, because 646391064525 - 2⁸ = 646391064269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4309273689 + ... + 4309273838.

It is an arithmetic number, because the mean of its divisors is an integer number (89058324456).

Almost surely, 2^646391064525 is an apocalyptic number.

It is an amenable number.

646391064525 is a deficient number, since it is larger than the sum of its proper divisors (422308828947).

646391064525 is a wasteful number, since it uses less digits than its factorization.

646391064525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8618547540 (or 8618547535 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 646391064525 in words is "six hundred forty-six billion, three hundred ninety-one million, sixty-four thousand, five hundred twenty-five".