51101500161591 has 32 divisors (see below), whose sum is σ = 83516241369600. Its totient is φ = 30622621803840.

The previous prime is 51101500161587. The next prime is 51101500161623. The reversal of 51101500161591 is 19516100510115.

51101500161591 is a `hidden beast` number, since 5 + 1 + 1 + 0 + 1 + 5 + 0 + 0 + 1 + 61 + 591 = 666.

It is not a de Polignac number, because 51101500161591 - 2² = 51101500161587 is a prime.

It is a super-3 number, since 3×51101500161591³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51101500161581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 966596731 + ... + 966649596.

It is an arithmetic number, because the mean of its divisors is an integer number (2609882542800).

Almost surely, 2^{51101500161591} is an apocalyptic number.

51101500161591 is a deficient number, since it is larger than the sum of its proper divisors (32414741208009).

51101500161591 is a wasteful number, since it uses less digits than its factorization.

51101500161591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933246436 (or 1933246430 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 36.

The spelling of 51101500161591 in words is "fifty-one trillion, one hundred one billion, five hundred million, one hundred sixty-one thousand, five hundred ninety-one".