25566005 has 4 divisors (see below), whose sum is σ = 30679212. Its totient is φ = 20452800.

The previous prime is 25565971. The next prime is 25566007. The reversal of 25566005 is 50066552.

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 13965169 + 11600836 = 3737^2 + 3406^2 .

It is not a de Polignac number, because 25566005 - 2⁶ = 25565941 is a prime.

It is a super-2 number, since 2×25566005² = 1307241223320050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25566007) 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, 2556596 + ... + 2556605.

It is an arithmetic number, because the mean of its divisors is an integer number (7669803).

Almost surely, 2^25566005 is an apocalyptic number.

It is an amenable number.

25566005 is a deficient number, since it is larger than the sum of its proper divisors (5113207).

25566005 is an equidigital number, since it uses as much as digits as its factorization.

25566005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5113206.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 25566005 is about 5056.2837143499. The cubic root of 25566005 is about 294.5920051748.

The spelling of 25566005 in words is "twenty-five million, five hundred sixty-six thousand, five".