251998594947 has 24 divisors (see below), whose sum is σ = 397508155200. Its totient is φ = 152565090480.

The previous prime is 251998594919. The next prime is 251998594949. The reversal of 251998594947 is 749495899152.

251998594947 is a `hidden beast` number, since 2 + 51 + 9 + 9 + 85 + 9 + 494 + 7 = 666.

251998594947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 251998594947 - 2¹⁴ = 251998578563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251998594949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1250197 + ... + 1437702.

It is an arithmetic number, because the mean of its divisors is an integer number (16562839800).

Almost surely, 2^251998594947 is an apocalyptic number.

251998594947 is a deficient number, since it is larger than the sum of its proper divisors (145509560253).

251998594947 is a wasteful number, since it uses less digits than its factorization.

251998594947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688863 (or 2688860 counting only the distinct ones).

The product of its digits is 293932800, while the sum is 72.

The spelling of 251998594947 in words is "two hundred fifty-one billion, nine hundred ninety-eight million, five hundred ninety-four thousand, nine hundred forty-seven".