25042165 has 4 divisors (see below), whose sum is σ = 30050604. Its totient is φ = 20033728.

The previous prime is 25042159. The next prime is 25042169. The reversal of 25042165 is 56124052.

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 11329956 + 13712209 = 3366^2 + 3703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25042165 is a prime.

It is a super-2 number, since 2×25042165² = 1254220055774450, 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 (25042169) 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, 2504212 + ... + 2504221.

It is an arithmetic number, because the mean of its divisors is an integer number (7512651).

Almost surely, 2^25042165 is an apocalyptic number.

It is an amenable number.

25042165 is a deficient number, since it is larger than the sum of its proper divisors (5008439).

25042165 is an equidigital number, since it uses as much as digits as its factorization.

25042165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5008438.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 25042165 is about 5004.2147236105. The cubic root of 25042165 is about 292.5660697659.

The spelling of 25042165 in words is "twenty-five million, forty-two thousand, one hundred sixty-five".