25664425 has 6 divisors (see below), whose sum is σ = 31823918. Its totient is φ = 20531520.

The previous prime is 25664423. The next prime is 25664437. The reversal of 25664425 is 52446652.

It can be written as a sum of positive squares in 3 ways, for example, as 2968729 + 22695696 = 1723^2 + 4764^2 .

It is not a de Polignac number, because 25664425 - 2¹ = 25664423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25664423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 513264 + ... + 513313.

Almost surely, 2^25664425 is an apocalyptic number.

25664425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25664425 is a deficient number, since it is larger than the sum of its proper divisors (6159493).

25664425 is a wasteful number, since it uses less digits than its factorization.

25664425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026587 (or 1026582 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

The square root of 25664425 is about 5066.0068101020. The cubic root of 25664425 is about 294.9695458364.

The spelling of 25664425 in words is "twenty-five million, six hundred sixty-four thousand, four hundred twenty-five".