51236127863561 has 2 divisors, whose sum is σ = 51236127863562. Its totient is φ = 51236127863560.

The previous prime is 51236127863537. The next prime is 51236127863581. The reversal of 51236127863561 is 16536872163215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51177483976336 + 58643887225 = 7153844^2 + 242165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51236127863561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51236127863497 and 51236127863506.

It is not a weakly prime, because it can be changed into another prime (51236127863581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25618063931780 + 25618063931781.

It is an arithmetic number, because the mean of its divisors is an integer number (25618063931781).

Almost surely, 2^{51236127863561} is an apocalyptic number.

It is an amenable number.

51236127863561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51236127863561 is an equidigital number, since it uses as much as digits as its factorization.

51236127863561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 56.

The spelling of 51236127863561 in words is "fifty-one trillion, two hundred thirty-six billion, one hundred twenty-seven million, eight hundred sixty-three thousand, five hundred sixty-one".