25165166 has 16 divisors (see below), whose sum is σ = 41050464. Its totient is φ = 11500704.

The previous prime is 25165159. The next prime is 25165171. The reversal of 25165166 is 66156152.

25165166 = 670² + 671² + ... + 721².

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, 2021 + ... + 7376.

It is an arithmetic number, because the mean of its divisors is an integer number (2565654).

Almost surely, 2^25165166 is an apocalyptic number.

25165166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25165166 is a deficient number, since it is larger than the sum of its proper divisors (15885298).

25165166 is a wasteful number, since it uses less digits than its factorization.

25165166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9515.

The product of its digits is 10800, while the sum is 32.

The square root of 25165166 is about 5016.4894099360. The cubic root of 25165166 is about 293.0442920147.

It can be divided in two parts, 251651 and 66, that multiplied together give a triangular number (16608966 = T₅₇₆₃).

The spelling of 25165166 in words is "twenty-five million, one hundred sixty-five thousand, one hundred sixty-six".