6661556116160 has 112 divisors (see below), whose sum is σ = 18215690711040. Its totient is φ = 2294890122240.

The previous prime is 6661556116129. The next prime is 6661556116177. The reversal of 6661556116160 is 616116551666.

It is a junction number, because it is equal to n+sod(n) for n = 6661556116099 and 6661556116108.

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, 49735424 + ... + 49869183.

Almost surely, 2^{6661556116160} is an apocalyptic number.

It is an amenable number.

6661556116160 is an abundant number, since it is smaller than the sum of its proper divisors (11554134594880).

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

6661556116160 is a wasteful number, since it uses less digits than its factorization.

6661556116160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99604654 (or 99604644 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 6661556116160 in words is "six trillion, six hundred sixty-one billion, five hundred fifty-six million, one hundred sixteen thousand, one hundred sixty".