251436320012 has 12 divisors (see below), whose sum is σ = 445583352480. Its totient is φ = 124126790736.

The previous prime is 251436319973. The next prime is 251436320033. The reversal of 251436320012 is 210023634152.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 397841963 + ... + 397842594.

It is an arithmetic number, because the mean of its divisors is an integer number (37131946040).

Almost surely, 2^251436320012 is an apocalyptic number.

It is an amenable number.

251436320012 is a deficient number, since it is larger than the sum of its proper divisors (194147032468).

251436320012 is a wasteful number, since it uses less digits than its factorization.

251436320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795684640 (or 795684638 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 251436320012 its reverse (210023634152), we get a palindrome (461459954164).

The spelling of 251436320012 in words is "two hundred fifty-one billion, four hundred thirty-six million, three hundred twenty thousand, twelve".