6561472220 has 48 divisors (see below), whose sum is σ = 13862923200. Its totient is φ = 2608674816.

The previous prime is 6561472163. The next prime is 6561472241. The reversal of 6561472220 is 222741656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2462609 + ... + 2465271.

It is an arithmetic number, because the mean of its divisors is an integer number (288810900).

Almost surely, 2^6561472220 is an apocalyptic number.

It is an amenable number.

6561472220 is an abundant number, since it is smaller than the sum of its proper divisors (7301450980).

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

6561472220 is a wasteful number, since it uses less digits than its factorization.

6561472220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374 (or 3372 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 6561472220 is about 81002.9148858237. The cubic root of 6561472220 is about 1872.1203531207.

The spelling of 6561472220 in words is "six billion, five hundred sixty-one million, four hundred seventy-two thousand, two hundred twenty".