25566361 has 4 divisors (see below), whose sum is σ = 25578000. Its totient is φ = 25554724.

The previous prime is 25566349. The next prime is 25566383. The reversal of 25566361 is 16366552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25566361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25563361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1411 + ... + 7288.

It is an arithmetic number, because the mean of its divisors is an integer number (6394500).

Almost surely, 2^25566361 is an apocalyptic number.

It is an amenable number.

25566361 is a deficient number, since it is larger than the sum of its proper divisors (11639).

25566361 is an equidigital number, since it uses as much as digits as its factorization.

25566361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11638.

The product of its digits is 32400, while the sum is 34.

The square root of 25566361 is about 5056.3189179481. The cubic root of 25566361 is about 294.5933725409.

The spelling of 25566361 in words is "twenty-five million, five hundred sixty-six thousand, three hundred sixty-one".