251717560072 has 16 divisors (see below), whose sum is σ = 514876827600. Its totient is φ = 114417072720.

The previous prime is 251717560067. The next prime is 251717560079. The reversal of 251717560072 is 270065717152.

It is not an unprimeable number, because it can be changed into a prime (251717560079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430213322 + ... + 1430213497.

It is an arithmetic number, because the mean of its divisors is an integer number (32179801725).

Almost surely, 2^251717560072 is an apocalyptic number.

251717560072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

251717560072 is an abundant number, since it is smaller than the sum of its proper divisors (263159267528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251717560072 is a wasteful number, since it uses less digits than its factorization.

251717560072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860426836 (or 2860426832 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 43.

The spelling of 251717560072 in words is "two hundred fifty-one billion, seven hundred seventeen million, five hundred sixty thousand, seventy-two".