25645651 has 2 divisors, whose sum is σ = 25645652. Its totient is φ = 25645650.

The previous prime is 25645619. The next prime is 25645663. The reversal of 25645651 is 15654652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25645651 - 2⁵ = 25645619 is a prime.

It is not a weakly prime, because it can be changed into another prime (25645601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822825 + 12822826.

It is an arithmetic number, because the mean of its divisors is an integer number (12822826).

Almost surely, 2^25645651 is an apocalyptic number.

25645651 is a deficient number, since it is larger than the sum of its proper divisors (1).

25645651 is an equidigital number, since it uses as much as digits as its factorization.

25645651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 34.

The square root of 25645651 is about 5064.1535324277. The cubic root of 25645651 is about 294.8976030709.

Subtracting from 25645651 its reverse (15654652), we obtain a palindrome (9990999).

The spelling of 25645651 in words is "twenty-five million, six hundred forty-five thousand, six hundred fifty-one".