18271011370861 has 2 divisors, whose sum is σ = 18271011370862. Its totient is φ = 18271011370860.

The previous prime is 18271011370849. The next prime is 18271011370867. The reversal of 18271011370861 is 16807311017281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17848985737636 + 422025633225 = 4224806^2 + 649635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18271011370861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18271011370867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9135505685430 + 9135505685431.

It is an arithmetic number, because the mean of its divisors is an integer number (9135505685431).

Almost surely, 2^{18271011370861} is an apocalyptic number.

It is an amenable number.

18271011370861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18271011370861 is an equidigital number, since it uses as much as digits as its factorization.

18271011370861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 46.

The spelling of 18271011370861 in words is "eighteen trillion, two hundred seventy-one billion, eleven million, three hundred seventy thousand, eight hundred sixty-one".