51480071538 has 64 divisors (see below), whose sum is σ = 121353830400. Its totient is φ = 14253345792.

The previous prime is 51480071521. The next prime is 51480071543. The reversal of 51480071538 is 83517008415.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 51480071538.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117138 + ... + 341586.

It is an arithmetic number, because the mean of its divisors is an integer number (1896153600).

Almost surely, 2^51480071538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51480071538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60676915200).

51480071538 is an abundant number, since it is smaller than the sum of its proper divisors (69873758862).

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

51480071538 is a wasteful number, since it uses less digits than its factorization.

51480071538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224631.

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 51480071538 in words is "fifty-one billion, four hundred eighty million, seventy-one thousand, five hundred thirty-eight".