51113194816 has 56 divisors (see below), whose sum is σ = 104846583296. Its totient is φ = 24697474560.

The previous prime is 51113194799. The next prime is 51113194843. The reversal of 51113194816 is 61849131115.

It is a happy number.

51113194816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51113194816² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 1424650 + ... + 1460086.

It is an arithmetic number, because the mean of its divisors is an integer number (1872260416).

Almost surely, 2^51113194816 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 51113194816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52423291648).

51113194816 is an abundant number, since it is smaller than the sum of its proper divisors (53733388480).

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

51113194816 is a wasteful number, since it uses less digits than its factorization.

51113194816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36207 (or 36197 counting only the distinct ones).

The product of its digits is 25920, while the sum is 40.

The spelling of 51113194816 in words is "fifty-one billion, one hundred thirteen million, one hundred ninety-four thousand, eight hundred sixteen".