51479916240 has 80 divisors (see below), whose sum is σ = 161000106048. Its totient is φ = 13606483968.

The previous prime is 51479916209. The next prime is 51479916311. The reversal of 51479916240 is 4261997415.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a self number, because there is not a number n which added to its sum of digits gives 51479916240.

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, 921994 + ... + 976233.

Almost surely, 2^51479916240 is an apocalyptic number.

It is an amenable number.

51479916240 is an abundant number, since it is smaller than the sum of its proper divisors (109520189808).

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

51479916240 is a wasteful number, since it uses less digits than its factorization.

51479916240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898356 (or 1898350 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 51479916240 in words is "fifty-one billion, four hundred seventy-nine million, nine hundred sixteen thousand, two hundred forty".