251795916972 has 72 divisors (see below), whose sum is σ = 664234771200. Its totient is φ = 80273397600.

The previous prime is 251795916971. The next prime is 251795916991. The reversal of 251795916972 is 279619597152.

251795916972 is a `hidden beast` number, since 2 + 517 + 9 + 59 + 1 + 69 + 7 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (251795916971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12037779 + ... + 12058677.

Almost surely, 2^251795916972 is an apocalyptic number.

It is an amenable number.

251795916972 is an abundant number, since it is smaller than the sum of its proper divisors (412438854228).

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

251795916972 is a wasteful number, since it uses less digits than its factorization.

251795916972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35483 (or 35478 counting only the distinct ones).

The product of its digits is 21432600, while the sum is 63.

The spelling of 251795916972 in words is "two hundred fifty-one billion, seven hundred ninety-five million, nine hundred sixteen thousand, nine hundred seventy-two".