51939332257 has 2 divisors, whose sum is σ = 51939332258. Its totient is φ = 51939332256.

The previous prime is 51939332239. The next prime is 51939332287. The reversal of 51939332257 is 75223393915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45782732961 + 6156599296 = 213969^2 + 78464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51939332257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51939332257.

It is not a weakly prime, because it can be changed into another prime (51939332227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25969666128 + 25969666129.

It is an arithmetic number, because the mean of its divisors is an integer number (25969666129).

Almost surely, 2^51939332257 is an apocalyptic number.

It is an amenable number.

51939332257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51939332257 is an equidigital number, since it uses as much as digits as its factorization.

51939332257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1530900, while the sum is 49.

The spelling of 51939332257 in words is "fifty-one billion, nine hundred thirty-nine million, three hundred thirty-two thousand, two hundred fifty-seven".