251640366044 has 6 divisors (see below), whose sum is σ = 440370640584. Its totient is φ = 125820183020.

The previous prime is 251640365993. The next prime is 251640366071. The reversal of 251640366044 is 440663046152.

It is a junction number, because it is equal to n+sod(n) for n = 251640365992 and 251640366010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31455045752 + ... + 31455045759.

It is an arithmetic number, because the mean of its divisors is an integer number (73395106764).

Almost surely, 2^251640366044 is an apocalyptic number.

It is an amenable number.

251640366044 is a deficient number, since it is larger than the sum of its proper divisors (188730274540).

251640366044 is a wasteful number, since it uses less digits than its factorization.

251640366044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62910091515 (or 62910091513 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 251640366044 in words is "two hundred fifty-one billion, six hundred forty million, three hundred sixty-six thousand, forty-four".