25564165 has 8 divisors (see below), whose sum is σ = 33465888. Its totient is φ = 18592080.

The previous prime is 25564129. The next prime is 25564183. The reversal of 25564165 is 56146552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25564165 - 2²¹ = 23467013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25564165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232347 + ... + 232456.

It is an arithmetic number, because the mean of its divisors is an integer number (4183236).

Almost surely, 2^25564165 is an apocalyptic number.

It is an amenable number.

25564165 is a deficient number, since it is larger than the sum of its proper divisors (7901723).

25564165 is a wasteful number, since it uses less digits than its factorization.

25564165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464819.

The product of its digits is 36000, while the sum is 34.

The square root of 25564165 is about 5056.1017592608. The cubic root of 25564165 is about 294.5849376869.

It can be divided in two parts, 25564 and 165, that multiplied together give a triangular number (4218060 = T₂₉₀₄).

The spelling of 25564165 in words is "twenty-five million, five hundred sixty-four thousand, one hundred sixty-five".