51906720222171 has 48 divisors (see below), whose sum is σ = 75491209422720. Its totient is φ = 34367402926080.

The previous prime is 51906720222109. The next prime is 51906720222179. The reversal of 51906720222171 is 17122202760915.

51906720222171 is a `hidden beast` number, since 5 + 190 + 6 + 72 + 0 + 222 + 171 = 666.

It is not a de Polignac number, because 51906720222171 - 2⁶ = 51906720222107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51906720222179) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5636516215 + ... + 5636525423.

It is an arithmetic number, because the mean of its divisors is an integer number (1572733529640).

Almost surely, 2^{51906720222171} is an apocalyptic number.

51906720222171 is a deficient number, since it is larger than the sum of its proper divisors (23584489200549).

51906720222171 is a wasteful number, since it uses less digits than its factorization.

51906720222171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13636 (or 13633 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 51906720222171 in words is "fifty-one trillion, nine hundred six billion, seven hundred twenty million, two hundred twenty-two thousand, one hundred seventy-one".