251231268672 has 84 divisors (see below), whose sum is σ = 720922384416. Its totient is φ = 83649173760.

The previous prime is 251231268671. The next prime is 251231268689. The reversal of 251231268672 is 276862132152.

251231268672 is a `hidden beast` number, since 2 + 512 + 3 + 1 + 2 + 68 + 6 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251231268671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265047 + ... + 756777.

Almost surely, 2^251231268672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251231268672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360461192208).

251231268672 is an abundant number, since it is smaller than the sum of its proper divisors (469691115744).

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

251231268672 is a wasteful number, since it uses less digits than its factorization.

251231268672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492636 (or 492623 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 251231268672 in words is "two hundred fifty-one billion, two hundred thirty-one million, two hundred sixty-eight thousand, six hundred seventy-two".