6561375824 has 40 divisors (see below), whose sum is σ = 12909673728. Its totient is φ = 3229976960.

The previous prime is 6561375803. The next prime is 6561375839. The reversal of 6561375824 is 4285731656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901769 + ... + 909015.

Almost surely, 2^6561375824 is an apocalyptic number.

It is an amenable number.

6561375824 is a deficient number, since it is larger than the sum of its proper divisors (6348297904).

6561375824 is a wasteful number, since it uses less digits than its factorization.

6561375824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8123 (or 8117 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The square root of 6561375824 is about 81002.3198680137. The cubic root of 6561375824 is about 1872.1111851681. Note that the first 4 decimals are identical.

The spelling of 6561375824 in words is "six billion, five hundred sixty-one million, three hundred seventy-five thousand, eight hundred twenty-four".