51111055996 has 144 divisors (see below), whose sum is σ = 122416213248. Its totient is φ = 18128448000.

The previous prime is 51111055993. The next prime is 51111056011. The reversal of 51111055996 is 69955011115.

It is a super-2 number, since 2×51111055996² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111055993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3793071 + ... + 3806521.

It is an arithmetic number, because the mean of its divisors is an integer number (850112592).

Almost surely, 2^51111055996 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 51111055996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61208106624).

51111055996 is an abundant number, since it is smaller than the sum of its proper divisors (71305157252).

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

51111055996 is a wasteful number, since it uses less digits than its factorization.

51111055996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13572 (or 13557 counting only the distinct ones).

The product of its (nonzero) digits is 60750, while the sum is 43.

The spelling of 51111055996 in words is "fifty-one billion, one hundred eleven million, fifty-five thousand, nine hundred ninety-six".