51138801057808 has 20 divisors (see below), whose sum is σ = 99116107371580. Its totient is φ = 25560450768384.

The previous prime is 51138801057797. The next prime is 51138801057811. The reversal of 51138801057808 is 80875010883115.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20424904049664 + 30713897008144 = 4519392^2 + 5542012^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559312893 + ... + 559404316.

It is an arithmetic number, because the mean of its divisors is an integer number (4955805368579).

Almost surely, 2^{51138801057808} is an apocalyptic number.

It is an amenable number.

51138801057808 is a deficient number, since it is larger than the sum of its proper divisors (47977306313772).

51138801057808 is a wasteful number, since it uses less digits than its factorization.

51138801057808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118720074 (or 1118720068 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 55.

The spelling of 51138801057808 in words is "fifty-one trillion, one hundred thirty-eight billion, eight hundred one million, fifty-seven thousand, eight hundred eight".