25566425 has 12 divisors (see below), whose sum is σ = 32138940. Its totient is φ = 20171520.

The previous prime is 25566389. The next prime is 25566427. The reversal of 25566425 is 52466552.

It can be written as a sum of positive squares in 6 ways, for example, as 53824 + 25512601 = 232^2 + 5051^2 .

It is not a de Polignac number, because 25566425 - 2²⁰ = 24517849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25566427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5180 + ... + 8829.

It is an arithmetic number, because the mean of its divisors is an integer number (2678245).

Almost surely, 2^25566425 is an apocalyptic number.

25566425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25566425 is a deficient number, since it is larger than the sum of its proper divisors (6572515).

25566425 is a wasteful number, since it uses less digits than its factorization.

25566425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14092 (or 14087 counting only the distinct ones).

The product of its digits is 72000, while the sum is 35.

The square root of 25566425 is about 5056.3252466589. The cubic root of 25566425 is about 294.5936183582.

The spelling of 25566425 in words is "twenty-five million, five hundred sixty-six thousand, four hundred twenty-five".