251281385612 has 12 divisors (see below), whose sum is σ = 439750732680. Its totient is φ = 125638319136.

The previous prime is 251281385569. The next prime is 251281385623. The reversal of 251281385612 is 216583182152.

It is a super-2 number, since 2×251281385612² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343538 + ... + 787769.

It is an arithmetic number, because the mean of its divisors is an integer number (36645894390).

Almost surely, 2^251281385612 is an apocalyptic number.

It is an amenable number.

251281385612 is a deficient number, since it is larger than the sum of its proper divisors (188469347068).

251281385612 is a wasteful number, since it uses less digits than its factorization.

251281385612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186840 (or 1186838 counting only the distinct ones).

The product of its digits is 230400, while the sum is 44.

The spelling of 251281385612 in words is "two hundred fifty-one billion, two hundred eighty-one million, three hundred eighty-five thousand, six hundred twelve".