251112165161 has 64 divisors (see below), whose sum is σ = 317982744576. Its totient is φ = 194793984000.

The previous prime is 251112165137. The next prime is 251112165203. The reversal of 251112165161 is 161561211152.

It is a de Polignac number, because none of the positive numbers 2^k-251112165161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251112165061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31178411 + ... + 31186463.

It is an arithmetic number, because the mean of its divisors is an integer number (4968480384).

Almost surely, 2^251112165161 is an apocalyptic number.

It is an amenable number.

251112165161 is a deficient number, since it is larger than the sum of its proper divisors (66870579415).

251112165161 is a wasteful number, since it uses less digits than its factorization.

251112165161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8322.

The product of its digits is 3600, while the sum is 32.

The spelling of 251112165161 in words is "two hundred fifty-one billion, one hundred twelve million, one hundred sixty-five thousand, one hundred sixty-one".