51913589520 has 320 divisors, whose sum is σ = 189431875584. Its totient is φ = 11638702080.

The previous prime is 51913589513. The next prime is 51913589521. The reversal of 51913589520 is 2598531915.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 51913589520.

It is not an unprimeable number, because it can be changed into a prime (51913589521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1628454 + ... + 1660026.

Almost surely, 2^51913589520 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 51913589520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94715937792).

51913589520 is an abundant number, since it is smaller than the sum of its proper divisors (137518286064).

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

51913589520 is a wasteful number, since it uses less digits than its factorization.

51913589520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31650 (or 31644 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 48.

The spelling of 51913589520 in words is "fifty-one billion, nine hundred thirteen million, five hundred eighty-nine thousand, five hundred twenty".