51571981404 has 36 divisors (see below), whose sum is σ = 130375499800. Its totient is φ = 17188947360.

The previous prime is 51571981399. The next prime is 51571981441. The reversal of 51571981404 is 40418917515.

51571981404 is a `hidden beast` number, since 5 + 1 + 57 + 198 + 1 + 404 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×51571981404² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51571981404.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 325047 + ... + 456945.

Almost surely, 2^51571981404 is an apocalyptic number.

It is an amenable number.

51571981404 is an abundant number, since it is smaller than the sum of its proper divisors (78803518396).

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

51571981404 is a wasteful number, since it uses less digits than its factorization.

51571981404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142770 (or 142765 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 51571981404 in words is "fifty-one billion, five hundred seventy-one million, nine hundred eighty-one thousand, four hundred four".