25632661 has 2 divisors, whose sum is σ = 25632662. Its totient is φ = 25632660.

The previous prime is 25632631. The next prime is 25632697. The reversal of 25632661 is 16623652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14676561 + 10956100 = 3831^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 25632661 - 2⁷ = 25632533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25632631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12816330 + 12816331.

It is an arithmetic number, because the mean of its divisors is an integer number (12816331).

Almost surely, 2^25632661 is an apocalyptic number.

It is an amenable number.

25632661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25632661 is an equidigital number, since it uses as much as digits as its factorization.

25632661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 25632661 is about 5062.8708259248. The cubic root of 25632661 is about 294.8478042853.

Subtracting from 25632661 its reverse (16623652), we obtain a palindrome (9009009).

The spelling of 25632661 in words is "twenty-five million, six hundred thirty-two thousand, six hundred sixty-one".