25636669 has 2 divisors, whose sum is σ = 25636670. Its totient is φ = 25636668.

The previous prime is 25636661. The next prime is 25636693. The reversal of 25636669 is 96663652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 4153444 = 4635^2 + 2038^2 .

It is a cyclic number.

It is not a de Polignac number, because 25636669 - 2³ = 25636661 is a prime.

It is a super-2 number, since 2×25636669² = 1314477594831122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25636661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12818334 + 12818335.

It is an arithmetic number, because the mean of its divisors is an integer number (12818335).

Almost surely, 2^25636669 is an apocalyptic number.

It is an amenable number.

25636669 is a deficient number, since it is larger than the sum of its proper divisors (1).

25636669 is an equidigital number, since it uses as much as digits as its factorization.

25636669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 43.

The square root of 25636669 is about 5063.2666333109. The cubic root of 25636669 is about 294.8631712477.

The spelling of 25636669 in words is "twenty-five million, six hundred thirty-six thousand, six hundred sixty-nine".