25665855 has 16 divisors (see below), whose sum is σ = 41192064. Its totient is φ = 13646240.

The previous prime is 25665839. The next prime is 25665859. The reversal of 25665855 is 55856652.

It is not a de Polignac number, because 25665855 - 2⁴ = 25665839 is a prime.

It is a super-2 number, since 2×25665855² = 1317472225762050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2740 + ... + 7670.

It is an arithmetic number, because the mean of its divisors is an integer number (2574504).

Almost surely, 2^25665855 is an apocalyptic number.

25665855 is a deficient number, since it is larger than the sum of its proper divisors (15526209).

25665855 is a wasteful number, since it uses less digits than its factorization.

25665855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286.

The product of its digits is 360000, while the sum is 42.

The square root of 25665855 is about 5066.1479449380. The cubic root of 25665855 is about 294.9750242189.

The spelling of 25665855 in words is "twenty-five million, six hundred sixty-five thousand, eight hundred fifty-five".