51271732885 has 4 divisors (see below), whose sum is σ = 61526079468. Its totient is φ = 41017386304.

The previous prime is 51271732867. The next prime is 51271732891. The reversal of 51271732885 is 58823717215.

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 31041506596 + 20230226289 = 176186^2 + 142233^2 .

It is a cyclic number.

It is not a de Polignac number, because 51271732885 - 2⁹ = 51271732373 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 5127173284 + ... + 5127173293.

It is an arithmetic number, because the mean of its divisors is an integer number (15381519867).

Almost surely, 2^51271732885 is an apocalyptic number.

It is an amenable number.

51271732885 is a deficient number, since it is larger than the sum of its proper divisors (10254346583).

51271732885 is a wasteful number, since it uses less digits than its factorization.

51271732885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10254346582.

The product of its digits is 940800, while the sum is 49.

The spelling of 51271732885 in words is "fifty-one billion, two hundred seventy-one million, seven hundred thirty-two thousand, eight hundred eighty-five".