251278022732 has 24 divisors (see below), whose sum is σ = 480361788480. Its totient is φ = 114062711760.

The previous prime is 251278022717. The next prime is 251278022761. The reversal of 251278022732 is 237220872152.

It is a self number, because there is not a number n which added to its sum of digits gives 251278022732.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3831398 + ... + 3896429.

It is an arithmetic number, because the mean of its divisors is an integer number (20015074520).

Almost surely, 2^251278022732 is an apocalyptic number.

251278022732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

251278022732 is a deficient number, since it is larger than the sum of its proper divisors (229083765748).

251278022732 is a wasteful number, since it uses less digits than its factorization.

251278022732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7728581 (or 7728579 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

Adding to 251278022732 its reverse (237220872152), we get a palindrome (488498894884).

The spelling of 251278022732 in words is "two hundred fifty-one billion, two hundred seventy-eight million, twenty-two thousand, seven hundred thirty-two".