51656511166171 has 4 divisors (see below), whose sum is σ = 51658507733272. Its totient is φ = 51654514599072.

The previous prime is 51656511166159. The next prime is 51656511166201. The reversal of 51656511166171 is 17166111565615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51656511166171 - 2²⁹ = 51655974295259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51656511160171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998244741 + ... + 998296486.

It is an arithmetic number, because the mean of its divisors is an integer number (12914626933318).

Almost surely, 2^{51656511166171} is an apocalyptic number.

51656511166171 is a deficient number, since it is larger than the sum of its proper divisors (1996567101).

51656511166171 is a wasteful number, since it uses less digits than its factorization.

51656511166171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996567100.

The product of its digits is 1134000, while the sum is 52.

The spelling of 51656511166171 in words is "fifty-one trillion, six hundred fifty-six billion, five hundred eleven million, one hundred sixty-six thousand, one hundred seventy-one".