25660047135397 has 2 divisors, whose sum is σ = 25660047135398. Its totient is φ = 25660047135396.

The previous prime is 25660047135389. The next prime is 25660047135427. The reversal of 25660047135397 is 79353174006652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14231009304801 + 11429037830596 = 3772401^2 + 3380686^2 .

It is a cyclic number.

It is not a de Polignac number, because 25660047135397 - 2³ = 25660047135389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25660047135367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12830023567698 + 12830023567699.

It is an arithmetic number, because the mean of its divisors is an integer number (12830023567699).

Almost surely, 2^{25660047135397} is an apocalyptic number.

It is an amenable number.

25660047135397 is a deficient number, since it is larger than the sum of its proper divisors (1).

25660047135397 is an equidigital number, since it uses as much as digits as its factorization.

25660047135397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28576800, while the sum is 58.

The spelling of 25660047135397 in words is "twenty-five trillion, six hundred sixty billion, forty-seven million, one hundred thirty-five thousand, three hundred ninety-seven".