25656425 has 6 divisors (see below), whose sum is σ = 31813998. Its totient is φ = 20525120.

The previous prime is 25656409. The next prime is 25656443. The reversal of 25656425 is 52465652.

It can be written as a sum of positive squares in 3 ways, for example, as 1371241 + 24285184 = 1171^2 + 4928^2 .

It is not a de Polignac number, because 25656425 - 2⁴ = 25656409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 513104 + ... + 513153.

It is an arithmetic number, because the mean of its divisors is an integer number (5302333).

Almost surely, 2^25656425 is an apocalyptic number.

25656425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25656425 is a deficient number, since it is larger than the sum of its proper divisors (6157573).

25656425 is a wasteful number, since it uses less digits than its factorization.

25656425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026267 (or 1026262 counting only the distinct ones).

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

The square root of 25656425 is about 5065.2171720470. The cubic root of 25656425 is about 294.9388937879.

The spelling of 25656425 in words is "twenty-five million, six hundred fifty-six thousand, four hundred twenty-five".