513644763640 has 16 divisors (see below), whose sum is σ = 1155700718280. Its totient is φ = 205457905440.

The previous prime is 513644763509. The next prime is 513644763659. The reversal of 513644763640 is 46367446315.

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, 6420559506 + ... + 6420559585.

Almost surely, 2^513644763640 is an apocalyptic number.

It is an amenable number.

513644763640 is an abundant number, since it is smaller than the sum of its proper divisors (642055954640).

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

513644763640 is a wasteful number, since it uses less digits than its factorization.

513644763640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12841119102 (or 12841119098 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 513644763640 in words is "five hundred thirteen billion, six hundred forty-four million, seven hundred sixty-three thousand, six hundred forty".