251187872864 has 12 divisors (see below), whose sum is σ = 494526124764. Its totient is φ = 125593936416.

The previous prime is 251187872863. The next prime is 251187872921. The reversal of 251187872864 is 468278781152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251187872863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3924810482 + ... + 3924810545.

It is an arithmetic number, because the mean of its divisors is an integer number (41210510397).

Almost surely, 2^251187872864 is an apocalyptic number.

It is an amenable number.

251187872864 is a deficient number, since it is larger than the sum of its proper divisors (243338251900).

251187872864 is an equidigital number, since it uses as much as digits as its factorization.

251187872864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7849621037 (or 7849621029 counting only the distinct ones).

The product of its digits is 12042240, while the sum is 59.

The spelling of 251187872864 in words is "two hundred fifty-one billion, one hundred eighty-seven million, eight hundred seventy-two thousand, eight hundred sixty-four".