25666413 has 16 divisors (see below), whose sum is σ = 37812096. Its totient is φ = 15403520.

The previous prime is 25666409. The next prime is 25666439. The reversal of 25666413 is 31466652.

It is a cyclic number.

It is not a de Polignac number, because 25666413 - 2² = 25666409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666013) 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, 9768 + ... + 12113.

It is an arithmetic number, because the mean of its divisors is an integer number (2363256).

Almost surely, 2^25666413 is an apocalyptic number.

25666413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

25666413 is a deficient number, since it is larger than the sum of its proper divisors (12145683).

25666413 is a wasteful number, since it uses less digits than its factorization.

25666413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21924.

The product of its digits is 25920, while the sum is 33.

The square root of 25666413 is about 5066.2030160664. The cubic root of 25666413 is about 294.9771618823.

The spelling of 25666413 in words is "twenty-five million, six hundred sixty-six thousand, four hundred thirteen".