25656361 has 4 divisors (see below), whose sum is σ = 26007892. Its totient is φ = 25304832.

The previous prime is 25656359. The next prime is 25656409. The reversal of 25656361 is 16365652.

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 6786025 + 18870336 = 2605^2 + 4344^2 .

It is a cyclic number.

It is not a de Polignac number, because 25656361 - 2¹ = 25656359 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25656331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175656 + ... + 175801.

It is an arithmetic number, because the mean of its divisors is an integer number (6501973).

Almost surely, 2^25656361 is an apocalyptic number.

It is an amenable number.

25656361 is a deficient number, since it is larger than the sum of its proper divisors (351531).

25656361 is an equidigital number, since it uses as much as digits as its factorization.

25656361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351530.

The product of its digits is 32400, while the sum is 34.

The square root of 25656361 is about 5065.2108544462. The cubic root of 25656361 is about 294.9386485458.

The spelling of 25656361 in words is "twenty-five million, six hundred fifty-six thousand, three hundred sixty-one".