2156501628171 has 28 divisors (see below), whose sum is σ = 3527207315160. Its totient is φ = 1306970678880.

The previous prime is 2156501628139. The next prime is 2156501628191. The reversal of 2156501628171 is 1718261056512.

2156501628171 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 5 + 0 + 1 + 628 + 17 + 1 = 666.

It is not a de Polignac number, because 2156501628171 - 2⁵ = 2156501628139 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2156501628191) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 134453986 + ... + 134470023.

Almost surely, 2^{2156501628171} is an apocalyptic number.

2156501628171 is a deficient number, since it is larger than the sum of its proper divisors (1370705686989).

2156501628171 is an equidigital number, since it uses as much as digits as its factorization.

2156501628171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268924038 (or 268924023 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 2156501628171 in words is "two trillion, one hundred fifty-six billion, five hundred one million, six hundred twenty-eight thousand, one hundred seventy-one".