25566631 has 2 divisors, whose sum is σ = 25566632. Its totient is φ = 25566630.

The previous prime is 25566587. The next prime is 25566641. The reversal of 25566631 is 13666552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25566631 - 2⁹ = 25566119 is a prime.

It is a super-2 number, since 2×25566631² = 1307305241380322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25566641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12783315 + 12783316.

It is an arithmetic number, because the mean of its divisors is an integer number (12783316).

Almost surely, 2^25566631 is an apocalyptic number.

25566631 is a deficient number, since it is larger than the sum of its proper divisors (1).

25566631 is an equidigital number, since it uses as much as digits as its factorization.

25566631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 25566631 is about 5056.3456171429. The cubic root of 25566631 is about 294.5944095798.

The spelling of 25566631 in words is "twenty-five million, five hundred sixty-six thousand, six hundred thirty-one".