25215165 has 32 divisors (see below), whose sum is σ = 47468160. Its totient is φ = 12655872.

The previous prime is 25215161. The next prime is 25215187. The reversal of 25215165 is 56151252.

It is not a de Polignac number, because 25215165 - 2² = 25215161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25215161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3199 + ... + 7788.

It is an arithmetic number, because the mean of its divisors is an integer number (1483380).

Almost surely, 2^25215165 is an apocalyptic number.

It is an amenable number.

25215165 is a deficient number, since it is larger than the sum of its proper divisors (22252995).

25215165 is a wasteful number, since it uses less digits than its factorization.

25215165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11018 (or 11012 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 25215165 is about 5021.4704021830. The cubic root of 25215165 is about 293.2382403824.

The spelling of 25215165 in words is "twenty-five million, two hundred fifteen thousand, one hundred sixty-five".