25656553 has 12 divisors (see below), whose sum is σ = 29355340. Its totient is φ = 22286592.

The previous prime is 25656551. The next prime is 25656559. The reversal of 25656553 is 35565652.

It can be written as a sum of positive squares in 6 ways, for example, as 375769 + 25280784 = 613^2 + 5028^2 .

It is not a de Polignac number, because 25656553 - 2¹ = 25656551 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25656551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343 + ... + 7171.

Almost surely, 2^25656553 is an apocalyptic number.

It is an amenable number.

25656553 is a deficient number, since it is larger than the sum of its proper divisors (3698787).

25656553 is a wasteful number, since it uses less digits than its factorization.

25656553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6876 (or 6859 counting only the distinct ones).

The product of its digits is 135000, while the sum is 37.

The square root of 25656553 is about 5065.2298072249. The cubic root of 25656553 is about 294.9393842708.

Subtracting 25656553 from its reverse (35565652), we obtain a palindrome (9909099).

The spelling of 25656553 in words is "twenty-five million, six hundred fifty-six thousand, five hundred fifty-three".