51115560016 has 80 divisors (see below), whose sum is σ = 109241758080. Its totient is φ = 23069634560.

The previous prime is 51115559983. The next prime is 51115560017. The reversal of 51115560016 is 61006551115.

51115560016 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 2×51115560016² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51115560016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115560017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619125 + ... + 696811.

It is an arithmetic number, because the mean of its divisors is an integer number (1365521976).

Almost surely, 2^51115560016 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 51115560016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54620879040).

51115560016 is an abundant number, since it is smaller than the sum of its proper divisors (58126198064).

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

51115560016 is a wasteful number, since it uses less digits than its factorization.

51115560016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77812 (or 77806 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 51115560016 in words is "fifty-one billion, one hundred fifteen million, five hundred sixty thousand, sixteen".