51138310885 has 4 divisors (see below), whose sum is σ = 61365973068. Its totient is φ = 40910648704.

The previous prime is 51138310877. The next prime is 51138310897. The reversal of 51138310885 is 58801383115.

It is a happy number.

51138310885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14868631969 + 36269678916 = 121937^2 + 190446^2 .

It is a cyclic number.

It is not a de Polignac number, because 51138310885 - 2³ = 51138310877 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 5113831084 + ... + 5113831093.

It is an arithmetic number, because the mean of its divisors is an integer number (15341493267).

Almost surely, 2^51138310885 is an apocalyptic number.

It is an amenable number.

51138310885 is a deficient number, since it is larger than the sum of its proper divisors (10227662183).

51138310885 is a wasteful number, since it uses less digits than its factorization.

51138310885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10227662182.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 51138310885 in words is "fifty-one billion, one hundred thirty-eight million, three hundred ten thousand, eight hundred eighty-five".