51480693918 has 48 divisors (see below), whose sum is σ = 116032597200. Its totient is φ = 16475907840.

The previous prime is 51480693917. The next prime is 51480693919. The reversal of 51480693918 is 81939608415.

51480693918 is a `hidden beast` number, since 514 + 80 + 6 + 9 + 39 + 18 = 666.

It is an interprime number because it is at equal distance from previous prime (51480693917) and next prime (51480693919).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51480693917) 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, 182043 + ... + 368918.

It is an arithmetic number, because the mean of its divisors is an integer number (2417345775).

Almost surely, 2^51480693918 is an apocalyptic number.

51480693918 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51480693918 is an abundant number, since it is smaller than the sum of its proper divisors (64551903282).

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

51480693918 is a wasteful number, since it uses less digits than its factorization.

51480693918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551177 (or 551174 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 51480693918 in words is "fifty-one billion, four hundred eighty million, six hundred ninety-three thousand, nine hundred eighteen".