25666855 has 16 divisors (see below), whose sum is σ = 33079104. Its totient is φ = 19048960.

The previous prime is 25666843. The next prime is 25666859. The reversal of 25666855 is 55866652.

It is not a de Polignac number, because 25666855 - 2¹⁵ = 25634087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3909 + ... + 8161.

It is an arithmetic number, because the mean of its divisors is an integer number (2067444).

Almost surely, 2^25666855 is an apocalyptic number.

25666855 is a deficient number, since it is larger than the sum of its proper divisors (7412249).

25666855 is a wasteful number, since it uses less digits than its factorization.

25666855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346.

The product of its digits is 432000, while the sum is 43.

The square root of 25666855 is about 5066.2466382915. The cubic root of 25666855 is about 294.9788551348.

The spelling of 25666855 in words is "twenty-five million, six hundred sixty-six thousand, eight hundred fifty-five".