51800816638 has 16 divisors (see below), whose sum is σ = 77897661696. Its totient is φ = 25834961880.

The previous prime is 51800816621. The next prime is 51800816659. The reversal of 51800816638 is 83661800815.

It is a super-3 number, since 3×51800816638³ (a number of 33 digits) contains 333 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, 5242843 + ... + 5252713.

It is an arithmetic number, because the mean of its divisors is an integer number (4868603856).

Almost surely, 2^51800816638 is an apocalyptic number.

51800816638 is a deficient number, since it is larger than the sum of its proper divisors (26096845058).

51800816638 is a wasteful number, since it uses less digits than its factorization.

51800816638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16239.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 51800816638 in words is "fifty-one billion, eight hundred million, eight hundred sixteen thousand, six hundred thirty-eight".