51533957384 has 96 divisors (see below), whose sum is σ = 122002836480. Its totient is φ = 20226278016.

The previous prime is 51533957329. The next prime is 51533957443. The reversal of 51533957384 is 48375933515.

It is a happy 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, 607379 + ... + 687005.

It is an arithmetic number, because the mean of its divisors is an integer number (1270862880).

Almost surely, 2^51533957384 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 51533957384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61001418240).

51533957384 is an abundant number, since it is smaller than the sum of its proper divisors (70468879096).

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

51533957384 is a wasteful number, since it uses less digits than its factorization.

51533957384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79787 (or 79776 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 53.

The spelling of 51533957384 in words is "fifty-one billion, five hundred thirty-three million, nine hundred fifty-seven thousand, three hundred eighty-four".