51938420885 has 32 divisors (see below), whose sum is σ = 69006813792. Its totient is φ = 37278766080.

The previous prime is 51938420869. The next prime is 51938420929. The reversal of 51938420885 is 58802483915.

It can be written as a sum of positive squares in 16 ways, for example, as 5300131204 + 46638289681 = 72802^2 + 215959^2 .

It is not a de Polignac number, because 51938420885 - 2⁴ = 51938420869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2386955 + ... + 2408615.

It is an arithmetic number, because the mean of its divisors is an integer number (2156462931).

Almost surely, 2^51938420885 is an apocalyptic number.

It is an amenable number.

51938420885 is a deficient number, since it is larger than the sum of its proper divisors (17068392907).

51938420885 is a wasteful number, since it uses less digits than its factorization.

51938420885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22713.

The product of its (nonzero) digits is 2764800, while the sum is 53.

The spelling of 51938420885 in words is "fifty-one billion, nine hundred thirty-eight million, four hundred twenty thousand, eight hundred eighty-five".