51489768960 has 800 divisors, whose sum is σ = 221977578240. Its totient is φ = 11143692288.

The previous prime is 51489768899. The next prime is 51489768971. The reversal of 51489768960 is 6986798415.

51489768960 is a `hidden beast` number, since 5 + 1 + 489 + 7 + 68 + 96 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 27577947 + ... + 27579813.

Almost surely, 2^51489768960 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 51489768960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110988789120).

51489768960 is an abundant number, since it is smaller than the sum of its proper divisors (170487809280).

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

51489768960 is a wasteful number, since it uses less digits than its factorization.

51489768960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928 (or 1903 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 51489768960 in words is "fifty-one billion, four hundred eighty-nine million, seven hundred sixty-eight thousand, nine hundred sixty".