6461515764 has 72 divisors (see below), whose sum is σ = 18592846272. Its totient is φ = 1872900480.

The previous prime is 6461515751. The next prime is 6461515799. The reversal of 6461515764 is 4675151646.

6461515764 is a `hidden beast` number, since 6 + 4 + 61 + 515 + 76 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345609 + ... + 363824.

It is an arithmetic number, because the mean of its divisors is an integer number (258233976).

Almost surely, 2^6461515764 is an apocalyptic number.

It is an amenable number.

6461515764 is an abundant number, since it is smaller than the sum of its proper divisors (12131330508).

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

6461515764 is a wasteful number, since it uses less digits than its factorization.

6461515764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709477 (or 709472 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 6461515764 is about 80383.5540642487. The cubic root of 6461515764 is about 1862.5651357729.

It can be divided in two parts, 6461 and 515764, that added together give a palindrome (522225).

The spelling of 6461515764 in words is "six billion, four hundred sixty-one million, five hundred fifteen thousand, seven hundred sixty-four".