25366609 has 2 divisors, whose sum is σ = 25366610. Its totient is φ = 25366608.

The previous prime is 25366591. The next prime is 25366639. The reversal of 25366609 is 90666352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16646400 + 8720209 = 4080^2 + 2953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25366609 is a prime.

It is not a weakly prime, because it can be changed into another prime (25366639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12683304 + 12683305.

It is an arithmetic number, because the mean of its divisors is an integer number (12683305).

Almost surely, 2^25366609 is an apocalyptic number.

It is an amenable number.

25366609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25366609 is an equidigital number, since it uses as much as digits as its factorization.

25366609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 25366609 is about 5036.5274743617. The cubic root of 25366609 is about 293.8241385827.

The spelling of 25366609 in words is "twenty-five million, three hundred sixty-six thousand, six hundred nine".