51551431974 has 48 divisors (see below), whose sum is σ = 127717873920. Its totient is φ = 14721283440.

The previous prime is 51551431963. The next prime is 51551431991. The reversal of 51551431974 is 47913415515.

51551431974 is a `hidden beast` number, since 5 + 1 + 551 + 4 + 3 + 1 + 97 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137367 + ... + 349245.

It is an arithmetic number, because the mean of its divisors is an integer number (2660789040).

Almost surely, 2^51551431974 is an apocalyptic number.

51551431974 is an abundant number, since it is smaller than the sum of its proper divisors (76166441946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51551431974 is a wasteful number, since it uses less digits than its factorization.

51551431974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213825 (or 213822 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The spelling of 51551431974 in words is "fifty-one billion, five hundred fifty-one million, four hundred thirty-one thousand, nine hundred seventy-four".