6561536364 has 36 divisors (see below), whose sum is σ = 16601463424. Its totient is φ = 2185153632.

The previous prime is 6561536363. The next prime is 6561536381. The reversal of 6561536364 is 4636351656.

6561536364 is a `hidden beast` number, since 6 + 5 + 6 + 1 + 5 + 3 + 636 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (6561536363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44707 + ... + 122970.

Almost surely, 2^6561536364 is an apocalyptic number.

It is an amenable number.

6561536364 is an abundant number, since it is smaller than the sum of its proper divisors (10039927060).

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

6561536364 is a wasteful number, since it uses less digits than its factorization.

6561536364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168774 (or 168769 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The square root of 6561536364 is about 81003.3108212251. The cubic root of 6561536364 is about 1872.1264536264.

The spelling of 6561536364 in words is "six billion, five hundred sixty-one million, five hundred thirty-six thousand, three hundred sixty-four".