25697776673 has 2 divisors, whose sum is σ = 25697776674. Its totient is φ = 25697776672.

The previous prime is 25697776627. The next prime is 25697776679. The reversal of 25697776673 is 37667779652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22358323729 + 3339452944 = 149527^2 + 57788^2 .

It is a cyclic number.

It is not a de Polignac number, because 25697776673 - 2¹⁴ = 25697760289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25697776679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12848888336 + 12848888337.

It is an arithmetic number, because the mean of its divisors is an integer number (12848888337).

Almost surely, 2^25697776673 is an apocalyptic number.

It is an amenable number.

25697776673 is a deficient number, since it is larger than the sum of its proper divisors (1).

25697776673 is an equidigital number, since it uses as much as digits as its factorization.

25697776673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140026320, while the sum is 65.

The spelling of 25697776673 in words is "twenty-five billion, six hundred ninety-seven million, seven hundred seventy-six thousand, six hundred seventy-three".