6561612264 has 64 divisors (see below), whose sum is σ = 17838446400. Its totient is φ = 2002904064.

The previous prime is 6561612251. The next prime is 6561612269. The reversal of 6561612264 is 4622161656.

It is not an unprimeable number, because it can be changed into a prime (6561612269) 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, 202234 + ... + 232425.

It is an arithmetic number, because the mean of its divisors is an integer number (278725725).

Almost surely, 2^6561612264 is an apocalyptic number.

It is an amenable number.

6561612264 is an abundant number, since it is smaller than the sum of its proper divisors (11276834136).

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

6561612264 is a wasteful number, since it uses less digits than its factorization.

6561612264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434722 (or 434718 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 6561612264 is about 81003.7793192392. The cubic root of 6561612264 is about 1872.1336721518.

The spelling of 6561612264 in words is "six billion, five hundred sixty-one million, six hundred twelve thousand, two hundred sixty-four".