51576721632 has 108 divisors (see below), whose sum is σ = 149860213776. Its totient is φ = 16826240640.

The previous prime is 51576721631. The next prime is 51576721639. The reversal of 51576721632 is 23612767515.

It is a happy number.

51576721632 is a `hidden beast` number, since 5 + 1 + 5 + 7 + 6 + 7 + 2 + 1 + 632 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51576721631) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 595657 + ... + 676727.

It is an arithmetic number, because the mean of its divisors is an integer number (1387594572).

Almost surely, 2^51576721632 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 51576721632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74930106888).

51576721632 is an abundant number, since it is smaller than the sum of its proper divisors (98283492144).

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

51576721632 is a wasteful number, since it uses less digits than its factorization.

51576721632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81181 (or 81123 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The spelling of 51576721632 in words is "fifty-one billion, five hundred seventy-six million, seven hundred twenty-one thousand, six hundred thirty-two".