251278321312 has 12 divisors (see below), whose sum is σ = 494704195146. Its totient is φ = 125639160640.

The previous prime is 251278321289. The next prime is 251278321321. The reversal of 251278321312 is 213123872152.

It can be written as a sum of positive squares in only one way, i.e., 226199164816 + 25079156496 = 475604^2 + 158364^2 .

It is a super-2 number, since 2×251278321312² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3926223739 + ... + 3926223802.

Almost surely, 2^251278321312 is an apocalyptic number.

It is an amenable number.

251278321312 is a deficient number, since it is larger than the sum of its proper divisors (243425873834).

251278321312 is an equidigital number, since it uses as much as digits as its factorization.

251278321312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852447551 (or 7852447543 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The spelling of 251278321312 in words is "two hundred fifty-one billion, two hundred seventy-eight million, three hundred twenty-one thousand, three hundred twelve".