25553659 has 2 divisors, whose sum is σ = 25553660. Its totient is φ = 25553658.

The previous prime is 25553639. The next prime is 25553663. The reversal of 25553659 is 95635552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25553659 - 2¹⁹ = 25029371 is a prime.

It is not a weakly prime, because it can be changed into another prime (25553639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12776829 + 12776830.

It is an arithmetic number, because the mean of its divisors is an integer number (12776830).

Almost surely, 2^25553659 is an apocalyptic number.

25553659 is a deficient number, since it is larger than the sum of its proper divisors (1).

25553659 is an equidigital number, since it uses as much as digits as its factorization.

25553659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 202500, while the sum is 40.

The square root of 25553659 is about 5055.0627097990. The cubic root of 25553659 is about 294.5445773698.

The spelling of 25553659 in words is "twenty-five million, five hundred fifty-three thousand, six hundred fifty-nine".