51917633904 has 80 divisors (see below), whose sum is σ = 139376793600. Its totient is φ = 16635152640.

The previous prime is 51917633899. The next prime is 51917633921. The reversal of 51917633904 is 40933671915.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104629 + ... + 338795.

It is an arithmetic number, because the mean of its divisors is an integer number (1742209920).

Almost surely, 2^51917633904 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 51917633904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69688396800).

51917633904 is an abundant number, since it is smaller than the sum of its proper divisors (87459159696).

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

51917633904 is a wasteful number, since it uses less digits than its factorization.

51917633904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234358 (or 234352 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 48.

The spelling of 51917633904 in words is "fifty-one billion, nine hundred seventeen million, six hundred thirty-three thousand, nine hundred four".