51705092137 has 2 divisors, whose sum is σ = 51705092138. Its totient is φ = 51705092136.

The previous prime is 51705092093. The next prime is 51705092143. The reversal of 51705092137 is 73129050715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50256224041 + 1448868096 = 224179^2 + 38064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51705092137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51705092137.

It is not a weakly prime, because it can be changed into another prime (51705092147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25852546068 + 25852546069.

It is an arithmetic number, because the mean of its divisors is an integer number (25852546069).

Almost surely, 2^51705092137 is an apocalyptic number.

It is an amenable number.

51705092137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51705092137 is an equidigital number, since it uses as much as digits as its factorization.

51705092137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66150, while the sum is 40.

The spelling of 51705092137 in words is "fifty-one billion, seven hundred five million, ninety-two thousand, one hundred thirty-seven".