25655643 has 32 divisors (see below), whose sum is σ = 43097600. Its totient is φ = 14953248.

The previous prime is 25655629. The next prime is 25655653. The reversal of 25655643 is 34655652.

It is a happy number.

25655643 is a `hidden beast` number, since 2 + 5 + 6 + 5 + 5 + 643 = 666.

It is not a de Polignac number, because 25655643 - 2⁵ = 25655611 is a prime.

25655643 is a modest number, since divided by 5643 gives 2565 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 25655598 and 25655607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25655653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4746 + ... + 8592.

It is an arithmetic number, because the mean of its divisors is an integer number (1346800).

Almost surely, 2^25655643 is an apocalyptic number.

25655643 is a deficient number, since it is larger than the sum of its proper divisors (17441957).

25655643 is a wasteful number, since it uses less digits than its factorization.

25655643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888 (or 3882 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 25655643 is about 5065.1399783224. The cubic root of 25655643 is about 294.9358972083.

Subtracting 25655643 from its reverse (34655652), we obtain a palindrome (9000009).

The spelling of 25655643 in words is "twenty-five million, six hundred fifty-five thousand, six hundred forty-three".