25653561 has 16 divisors (see below), whose sum is σ = 36319104. Its totient is φ = 16050944.

The previous prime is 25653559. The next prime is 25653581. The reversal of 25653561 is 16535652.

It is a cyclic number.

It is not a de Polignac number, because 25653561 - 2¹ = 25653559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25653521) 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 in 15 ways as a sum of consecutive naturals, for example, 34156 + ... + 34898.

It is an arithmetic number, because the mean of its divisors is an integer number (2269944).

Almost surely, 2^25653561 is an apocalyptic number.

It is an amenable number.

25653561 is a deficient number, since it is larger than the sum of its proper divisors (10665543).

25653561 is a wasteful number, since it uses less digits than its factorization.

25653561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its digits is 27000, while the sum is 33.

The square root of 25653561 is about 5064.9344516983. The cubic root of 25653561 is about 294.9279188056.

The spelling of 25653561 in words is "twenty-five million, six hundred fifty-three thousand, five hundred sixty-one".