25605641 has 4 divisors (see below), whose sum is σ = 25666884. Its totient is φ = 25544400.

The previous prime is 25605589. The next prime is 25605649. The reversal of 25605641 is 14650652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4857616 + 20748025 = 2204^2 + 4555^2 .

It is a cyclic number.

It is not a de Polignac number, because 25605641 - 2⁶ = 25605577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25605649) 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, 29990 + ... + 30831.

It is an arithmetic number, because the mean of its divisors is an integer number (6416721).

Almost surely, 2^25605641 is an apocalyptic number.

It is an amenable number.

25605641 is a deficient number, since it is larger than the sum of its proper divisors (61243).

25605641 is an equidigital number, since it uses as much as digits as its factorization.

25605641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61242.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25605641 is about 5060.2016758228. The cubic root of 25605641 is about 294.7441658240.

The spelling of 25605641 in words is "twenty-five million, six hundred five thousand, six hundred forty-one".