25509669 has 4 divisors (see below), whose sum is σ = 34012896. Its totient is φ = 17006444.

The previous prime is 25509643. The next prime is 25509709. The reversal of 25509669 is 96690552.

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 25509669 - 2⁸ = 25509413 is a prime.

It is a super-2 number, since 2×25509669² = 1301486424979122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25509669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25509619) 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 3 ways as a sum of consecutive naturals, for example, 4251609 + ... + 4251614.

It is an arithmetic number, because the mean of its divisors is an integer number (8503224).

Almost surely, 2^25509669 is an apocalyptic number.

It is an amenable number.

25509669 is a deficient number, since it is larger than the sum of its proper divisors (8503227).

25509669 is an equidigital number, since it uses as much as digits as its factorization.

25509669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8503226.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 25509669 is about 5050.7097521042. The cubic root of 25509669 is about 294.3754631914.

The spelling of 25509669 in words is "twenty-five million, five hundred nine thousand, six hundred sixty-nine".