51909788889 has 48 divisors (see below), whose sum is σ = 92302639104. Its totient is φ = 27457768800.

The previous prime is 51909788857. The next prime is 51909788891. The reversal of 51909788889 is 98888790915.

It is not a de Polignac number, because 51909788889 - 2⁵ = 51909788857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51909788389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 532897 + ... + 622734.

It is an arithmetic number, because the mean of its divisors is an integer number (1922971648).

Almost surely, 2^51909788889 is an apocalyptic number.

It is an amenable number.

51909788889 is a deficient number, since it is larger than the sum of its proper divisors (40392850215).

51909788889 is a wasteful number, since it uses less digits than its factorization.

51909788889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155698 (or 1155695 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 72.

The spelling of 51909788889 in words is "fifty-one billion, nine hundred nine million, seven hundred eighty-eight thousand, eight hundred eighty-nine".