6561700400 has 30 divisors (see below), whose sum is σ = 15764486172. Its totient is φ = 2624680000.

The previous prime is 6561700381. The next prime is 6561700433. The reversal of 6561700400 is 40071656.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8201726 + ... + 8202525.

Almost surely, 2^6561700400 is an apocalyptic number.

It is an amenable number.

6561700400 is an abundant number, since it is smaller than the sum of its proper divisors (9202785772).

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

6561700400 is a wasteful number, since it uses less digits than its factorization.

6561700400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16404269 (or 16404258 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 6561700400 is about 81004.3233414118. The cubic root of 6561700400 is about 1872.1420543210.

The spelling of 6561700400 in words is "six billion, five hundred sixty-one million, seven hundred thousand, four hundred".