512865815640 has 64 divisors (see below), whose sum is σ = 1539075103200. Its totient is φ = 136721759232.

The previous prime is 512865815617. The next prime is 512865815641. The reversal of 512865815640 is 46518568215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512865815641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274317 + ... + 1049276.

Almost surely, 2^512865815640 is an apocalyptic number.

It is an amenable number.

512865815640 is an abundant number, since it is smaller than the sum of its proper divisors (1026209287560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

512865815640 is a wasteful number, since it uses less digits than its factorization.

512865815640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326836 (or 1326832 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 51.

The spelling of 512865815640 in words is "five hundred twelve billion, eight hundred sixty-five million, eight hundred fifteen thousand, six hundred forty".