251278321343 has 12 divisors (see below), whose sum is σ = 292315893912. Its totient is φ = 215372178000.

The previous prime is 251278321321. The next prime is 251278321351. The reversal of 251278321343 is 343123872152.

It is not a de Polignac number, because 251278321343 - 2⁶ = 251278321279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251278321343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251278321243) 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, 1201796 + ... + 1395302.

It is an arithmetic number, because the mean of its divisors is an integer number (24359657826).

Almost surely, 2^251278321343 is an apocalyptic number.

251278321343 is a deficient number, since it is larger than the sum of its proper divisors (41037572569).

251278321343 is a wasteful number, since it uses less digits than its factorization.

251278321343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220022 (or 220015 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The spelling of 251278321343 in words is "two hundred fifty-one billion, two hundred seventy-eight million, three hundred twenty-one thousand, three hundred forty-three".