25653665 has 4 divisors (see below), whose sum is σ = 30784404. Its totient is φ = 20522928.

The previous prime is 25653637. The next prime is 25653689. The reversal of 25653665 is 56635652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11785489 + 13868176 = 3433^2 + 3724^2 .

It is a cyclic number.

It is not a de Polignac number, because 25653665 - 2⁶ = 25653601 is a prime.

It is a super-2 number, since 2×25653665² = 1316221055864450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565362 + ... + 2565371.

It is an arithmetic number, because the mean of its divisors is an integer number (7696101).

Almost surely, 2^25653665 is an apocalyptic number.

It is an amenable number.

25653665 is a deficient number, since it is larger than the sum of its proper divisors (5130739).

25653665 is an equidigital number, since it uses as much as digits as its factorization.

25653665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130738.

The product of its digits is 162000, while the sum is 38.

The square root of 25653665 is about 5064.9447183558. The cubic root of 25653665 is about 294.9283173528.

The spelling of 25653665 in words is "twenty-five million, six hundred fifty-three thousand, six hundred sixty-five".