51815606832 has 120 divisors (see below), whose sum is σ = 159730990848. Its totient is φ = 15549206400.

The previous prime is 51815606783. The next prime is 51815606839. The reversal of 51815606832 is 23860651815.

51815606832 is a `hidden beast` number, since 5 + 1 + 8 + 1 + 5 + 606 + 8 + 32 = 666.

It is a super-2 number, since 2×51815606832² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51815606839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4357 + ... + 321947.

Almost surely, 2^51815606832 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 51815606832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79865495424).

51815606832 is an abundant number, since it is smaller than the sum of its proper divisors (107915384016).

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

51815606832 is a wasteful number, since it uses less digits than its factorization.

51815606832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317719 (or 317710 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 51815606832 in words is "fifty-one billion, eight hundred fifteen million, six hundred six thousand, eight hundred thirty-two".