2155156165566 has 48 divisors (see below), whose sum is σ = 4785051293568. Its totient is φ = 700621171200.

The previous prime is 2155156165543. The next prime is 2155156165571. The reversal of 2155156165566 is 6655616515512.

2155156165566 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 15 + 6 + 1 + 65 + 566 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1633971 + ... + 2642001.

It is an arithmetic number, because the mean of its divisors is an integer number (99688568616).

Almost surely, 2^{2155156165566} is an apocalyptic number.

2155156165566 is an abundant number, since it is smaller than the sum of its proper divisors (2629895128002).

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

2155156165566 is a wasteful number, since it uses less digits than its factorization.

2155156165566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010977 (or 1010974 counting only the distinct ones).

The product of its digits is 8100000, while the sum is 54.

The spelling of 2155156165566 in words is "two trillion, one hundred fifty-five billion, one hundred fifty-six million, one hundred sixty-five thousand, five hundred sixty-six".