51191697804 has 24 divisors (see below), whose sum is σ = 128635548720. Its totient is φ = 15751291584.

The previous prime is 51191697779. The next prime is 51191697829. The reversal of 51191697804 is 40879619115.

51191697804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51191697779) and next prime (51191697829).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164075799 + ... + 164076110.

It is an arithmetic number, because the mean of its divisors is an integer number (5359814530).

Almost surely, 2^51191697804 is an apocalyptic number.

It is an amenable number.

51191697804 is an abundant number, since it is smaller than the sum of its proper divisors (77443850916).

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

51191697804 is a wasteful number, since it uses less digits than its factorization.

51191697804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328151929 (or 328151927 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 51.

The spelling of 51191697804 in words is "fifty-one billion, one hundred ninety-one million, six hundred ninety-seven thousand, eight hundred four".