2166571556120 has 16 divisors (see below), whose sum is σ = 4874786001360. Its totient is φ = 866628622432.

The previous prime is 2166571556113. The next prime is 2166571556213. The reversal of 2166571556120 is 216551756612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27082144412 + ... + 27082144491.

It is an arithmetic number, because the mean of its divisors is an integer number (304674125085).

Almost surely, 2^{2166571556120} is an apocalyptic number.

2166571556120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166571556120 is an abundant number, since it is smaller than the sum of its proper divisors (2708214445240).

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

2166571556120 is a wasteful number, since it uses less digits than its factorization.

2166571556120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54164288914 (or 54164288910 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 2166571556120 in words is "two trillion, one hundred sixty-six billion, five hundred seventy-one million, five hundred fifty-six thousand, one hundred twenty".