6561616870160 has 80 divisors (see below), whose sum is σ = 16648490267712. Its totient is φ = 2385204672000.

The previous prime is 6561616870091. The next prime is 6561616870217. The reversal of 6561616870160 is 610786161656.

It is a tau number, because it is divible by the number of its divisors (80).

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, 1201202 + ... + 3816558.

Almost surely, 2^{6561616870160} is an apocalyptic number.

It is an amenable number.

6561616870160 is an abundant number, since it is smaller than the sum of its proper divisors (10086873397552).

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

6561616870160 is a wasteful number, since it uses less digits than its factorization.

6561616870160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618232 (or 2618226 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 6561616870160 in words is "six trillion, five hundred sixty-one billion, six hundred sixteen million, eight hundred seventy thousand, one hundred sixty".