6516521464 has 16 divisors (see below), whose sum is σ = 12937212000. Its totient is φ = 3066598272.

The previous prime is 6516521449. The next prime is 6516521519. The reversal of 6516521464 is 4641256156.

It is a congruent 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, 23957664 + ... + 23957935.

It is an arithmetic number, because the mean of its divisors is an integer number (808575750).

Almost surely, 2^6516521464 is an apocalyptic number.

It is an amenable number.

6516521464 is a deficient number, since it is larger than the sum of its proper divisors (6420690536).

6516521464 is a wasteful number, since it uses less digits than its factorization.

6516521464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47915622 (or 47915618 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 6516521464 is about 80724.9742273108. The cubic root of 6516521464 is about 1867.8354341803.

The spelling of 6516521464 in words is "six billion, five hundred sixteen million, five hundred twenty-one thousand, four hundred sixty-four".