51374878464 has 576 divisors, whose sum is σ = 181442838528. Its totient is φ = 12530073600.

The previous prime is 51374878453. The next prime is 51374878493. The reversal of 51374878464 is 46487847315.

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 63 ways as a sum of consecutive naturals, for example, 49829629 + ... + 49830659.

It is an arithmetic number, because the mean of its divisors is an integer number (315004928).

Almost surely, 2^51374878464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51374878464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90721419264).

51374878464 is an abundant number, since it is smaller than the sum of its proper divisors (130067960064).

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

51374878464 is a wasteful number, since it uses less digits than its factorization.

51374878464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124 (or 1110 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 57.

The spelling of 51374878464 in words is "fifty-one billion, three hundred seventy-four million, eight hundred seventy-eight thousand, four hundred sixty-four".