251404891156 has 24 divisors (see below), whose sum is σ = 452675527136. Its totient is φ = 122081450400.

The previous prime is 251404891151. The next prime is 251404891159. The reversal of 251404891156 is 651198404152.

251404891156 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251404891151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471770 + ... + 1633681.

Almost surely, 2^251404891156 is an apocalyptic number.

It is an amenable number.

251404891156 is a deficient number, since it is larger than the sum of its proper divisors (201270635980).

251404891156 is a wasteful number, since it uses less digits than its factorization.

251404891156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106039 (or 3106037 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 251404891156 in words is "two hundred fifty-one billion, four hundred four million, eight hundred ninety-one thousand, one hundred fifty-six".