251500165161 has 16 divisors (see below), whose sum is σ = 384926628864. Its totient is φ = 143081274384.

The previous prime is 251500165151. The next prime is 251500165199. The reversal of 251500165161 is 161561005152.

It is not a de Polignac number, because 251500165161 - 2⁶ = 251500165097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251500165151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26374525 + ... + 26384058.

It is an arithmetic number, because the mean of its divisors is an integer number (24057914304).

Almost surely, 2^251500165161 is an apocalyptic number.

251500165161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251500165161 is a deficient number, since it is larger than the sum of its proper divisors (133426463703).

251500165161 is a wasteful number, since it uses less digits than its factorization.

251500165161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52758820.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 251500165161 in words is "two hundred fifty-one billion, five hundred million, one hundred sixty-five thousand, one hundred sixty-one".