25663345361 has 2 divisors, whose sum is σ = 25663345362. Its totient is φ = 25663345360.

The previous prime is 25663345313. The next prime is 25663345369. The reversal of 25663345361 is 16354336652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18317998336 + 7345347025 = 135344^2 + 85705^2 .

It is a cyclic number.

It is not a de Polignac number, because 25663345361 - 2⁶ = 25663345297 is a prime.

It is not a weakly prime, because it can be changed into another prime (25663345369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12831672680 + 12831672681.

It is an arithmetic number, because the mean of its divisors is an integer number (12831672681).

Almost surely, 2^25663345361 is an apocalyptic number.

It is an amenable number.

25663345361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25663345361 is an equidigital number, since it uses as much as digits as its factorization.

25663345361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 44.

The spelling of 25663345361 in words is "twenty-five billion, six hundred sixty-three million, three hundred forty-five thousand, three hundred sixty-one".