25645663 has 2 divisors, whose sum is σ = 25645664. Its totient is φ = 25645662.

The previous prime is 25645651. The next prime is 25645679. The reversal of 25645663 is 36654652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25645663 - 2¹³ = 25637471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25640663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822831 + 12822832.

It is an arithmetic number, because the mean of its divisors is an integer number (12822832).

Almost surely, 2^25645663 is an apocalyptic number.

25645663 is a deficient number, since it is larger than the sum of its proper divisors (1).

25645663 is an equidigital number, since it uses as much as digits as its factorization.

25645663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 37.

The square root of 25645663 is about 5064.1547172258. The cubic root of 25645663 is about 294.8976490666.

The spelling of 25645663 in words is "twenty-five million, six hundred forty-five thousand, six hundred sixty-three".