51169393688 has 64 divisors (see below), whose sum is σ = 112799831040. Its totient is φ = 21306334464.

The previous prime is 51169393669. The next prime is 51169393697. The reversal of 51169393688 is 88639396115.

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, 289631 + ... + 431537.

It is an arithmetic number, because the mean of its divisors is an integer number (1762497360).

Almost surely, 2^51169393688 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 51169393688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56399915520).

51169393688 is an abundant number, since it is smaller than the sum of its proper divisors (61630437352).

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

51169393688 is a wasteful number, since it uses less digits than its factorization.

51169393688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142104 (or 142100 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 59.

The spelling of 51169393688 in words is "fifty-one billion, one hundred sixty-nine million, three hundred ninety-three thousand, six hundred eighty-eight".