51800816637 has 48 divisors (see below), whose sum is σ = 84070846080. Its totient is φ = 30562262016.

The previous prime is 51800816621. The next prime is 51800816659. The reversal of 51800816637 is 73661800815.

51800816637 is a `hidden beast` number, since 5 + 1 + 8 + 0 + 0 + 8 + 1 + 6 + 637 = 666.

It is not a de Polignac number, because 51800816637 - 2⁴ = 51800816621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51800816592 and 51800816601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51800816437) 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, 82873 + ... + 332369.

It is an arithmetic number, because the mean of its divisors is an integer number (1751475960).

Almost surely, 2^51800816637 is an apocalyptic number.

It is an amenable number.

51800816637 is a deficient number, since it is larger than the sum of its proper divisors (32270029443).

51800816637 is a wasteful number, since it uses less digits than its factorization.

51800816637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249602 (or 249599 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 51800816637 in words is "fifty-one billion, eight hundred million, eight hundred sixteen thousand, six hundred thirty-seven".