51918939016 has 48 divisors (see below), whose sum is σ = 116302178700. Its totient is φ = 21649590144.

The previous prime is 51918938963. The next prime is 51918939101. The reversal of 51918939016 is 61093981915.

It can be written as a sum of positive squares in 2 ways, for example, as 47423772900 + 4495166116 = 217770^2 + 67046^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1775311 + ... + 1804318.

Almost surely, 2^51918939016 is an apocalyptic number.

51918939016 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51918939016 is an abundant number, since it is smaller than the sum of its proper divisors (64383239684).

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

51918939016 is a wasteful number, since it uses less digits than its factorization.

51918939016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579686 (or 3579675 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 52.

The spelling of 51918939016 in words is "fifty-one billion, nine hundred eighteen million, nine hundred thirty-nine thousand, sixteen".