25641656 has 16 divisors (see below), whose sum is σ = 48225840. Its totient is φ = 12781440.

The previous prime is 25641653. The next prime is 25641667. The reversal of 25641656 is 65614652.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060 + ... + 7451.

It is an arithmetic number, because the mean of its divisors is an integer number (3014115).

Almost surely, 2^25641656 is an apocalyptic number.

It is an amenable number.

25641656 is a deficient number, since it is larger than the sum of its proper divisors (22584184).

25641656 is a wasteful number, since it uses less digits than its factorization.

25641656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854 (or 9850 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 25641656 is about 5063.7590779973. The cubic root of 25641656 is about 294.8822895309.

The spelling of 25641656 in words is "twenty-five million, six hundred forty-one thousand, six hundred fifty-six".