25656869 has 4 divisors (see below), whose sum is σ = 29322144. Its totient is φ = 21991596.

The previous prime is 25656817. The next prime is 25656887. The reversal of 25656869 is 96865652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25656869 - 2¹² = 25652773 is a prime.

It is a super-2 number, since 2×25656869² = 1316549853766322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25656899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1832627 + ... + 1832640.

It is an arithmetic number, because the mean of its divisors is an integer number (7330536).

Almost surely, 2^25656869 is an apocalyptic number.

It is an amenable number.

25656869 is a deficient number, since it is larger than the sum of its proper divisors (3665275).

25656869 is an equidigital number, since it uses as much as digits as its factorization.

25656869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665274.

The product of its digits is 777600, while the sum is 47.

The square root of 25656869 is about 5065.2610001855. The cubic root of 25656869 is about 294.9405951435.

The spelling of 25656869 in words is "twenty-five million, six hundred fifty-six thousand, eight hundred sixty-nine".