251071043258 has 12 divisors (see below), whose sum is σ = 438093351162. Its totient is φ = 107601875640.

The previous prime is 251071043239. The next prime is 251071043263. The reversal of 251071043258 is 852340170152.

It can be written as a sum of positive squares in only one way, i.e., 128957837449 + 122113205809 = 359107^2 + 349447^2 .

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 in 5 ways as a sum of consecutive naturals, for example, 1280974613 + ... + 1280974808.

Almost surely, 2^251071043258 is an apocalyptic number.

251071043258 is a deficient number, since it is larger than the sum of its proper divisors (187022307904).

251071043258 is a wasteful number, since it uses less digits than its factorization.

251071043258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561949437 (or 2561949430 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 251071043258 in words is "two hundred fifty-one billion, seventy-one million, forty-three thousand, two hundred fifty-eight".