25565601 has 4 divisors (see below), whose sum is σ = 34087472. Its totient is φ = 17043732.

The previous prime is 25565597. The next prime is 25565641. The reversal of 25565601 is 10656552.

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.

It is not a de Polignac number, because 25565601 - 2² = 25565597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25565641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4260931 + ... + 4260936.

It is an arithmetic number, because the mean of its divisors is an integer number (8521868).

Almost surely, 2^25565601 is an apocalyptic number.

It is an amenable number.

25565601 is a deficient number, since it is larger than the sum of its proper divisors (8521871).

25565601 is an equidigital number, since it uses as much as digits as its factorization.

25565601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8521870.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 25565601 is about 5056.2437639022. The cubic root of 25565601 is about 294.5904534293.

It can be divided in two parts, 255 and 65601, that added together give a palindrome (65856).

The spelling of 25565601 in words is "twenty-five million, five hundred sixty-five thousand, six hundred one".