25980336662681 has 2 divisors, whose sum is σ = 25980336662682. Its totient is φ = 25980336662680.

The previous prime is 25980336662653. The next prime is 25980336662699. The reversal of 25980336662681 is 18626663308952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25980336662281 + 400 = 5097091^2 + 20^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25980336662681 is a prime.

It is a super-2 number, since 2×25980336662681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25980336662611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12990168331340 + 12990168331341.

It is an arithmetic number, because the mean of its divisors is an integer number (12990168331341).

Almost surely, 2^{25980336662681} is an apocalyptic number.

It is an amenable number.

25980336662681 is a deficient number, since it is larger than the sum of its proper divisors (1).

25980336662681 is an equidigital number, since it uses as much as digits as its factorization.

25980336662681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134369280, while the sum is 65.

The spelling of 25980336662681 in words is "twenty-five trillion, nine hundred eighty billion, three hundred thirty-six million, six hundred sixty-two thousand, six hundred eighty-one".