25665101 has 16 divisors (see below), whose sum is σ = 32227200. Its totient is φ = 19855680.

The previous prime is 25665097. The next prime is 25665103. The reversal of 25665101 is 10156652.

It is a cyclic number.

It is not a de Polignac number, because 25665101 - 2² = 25665097 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 (25665103) 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, 10355 + ... + 12591.

It is an arithmetic number, because the mean of its divisors is an integer number (2014200).

Almost surely, 2^25665101 is an apocalyptic number.

It is an amenable number.

25665101 is a deficient number, since it is larger than the sum of its proper divisors (6562099).

25665101 is a wasteful number, since it uses less digits than its factorization.

25665101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25665101 is about 5066.0735288782. The cubic root of 25665101 is about 294.9721356426.

It can be divided in two parts, 2566 and 5101, that added together give a palindrome (7667).

The spelling of 25665101 in words is "twenty-five million, six hundred sixty-five thousand, one hundred one".