51915064320 has 616 divisors, whose sum is σ = 213498890304. Its totient is φ = 11860328448.

The previous prime is 51915064309. The next prime is 51915064337. The reversal of 51915064320 is 2346051915.

51915064320 is a `hidden beast` number, since 5 + 1 + 9 + 1 + 5 + 0 + 643 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 26126367 + ... + 26128353.

Almost surely, 2^51915064320 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 51915064320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106749445152).

51915064320 is an abundant number, since it is smaller than the sum of its proper divisors (161583825984).

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

51915064320 is an equidigital number, since it uses as much as digits as its factorization.

51915064320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 51915064320 in words is "fifty-one billion, nine hundred fifteen million, sixty-four thousand, three hundred twenty".