51638103984 has 80 divisors (see below), whose sum is σ = 137442989792. Its totient is φ = 16693807104.

The previous prime is 51638103971. The next prime is 51638104003. The reversal of 51638103984 is 48930183615.

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

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, 509442 + ... + 602334.

Almost surely, 2^51638103984 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 51638103984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68721494896).

51638103984 is an abundant number, since it is smaller than the sum of its proper divisors (85804885808).

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

51638103984 is a wasteful number, since it uses less digits than its factorization.

51638103984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93254 (or 93248 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 51638103984 in words is "fifty-one billion, six hundred thirty-eight million, one hundred three thousand, nine hundred eighty-four".