25366643 has 2 divisors, whose sum is σ = 25366644. Its totient is φ = 25366642.

The previous prime is 25366639. The next prime is 25366661. The reversal of 25366643 is 34666352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25366643 - 2² = 25366639 is a prime.

It is not a weakly prime, because it can be changed into another prime (25966643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12683321 + 12683322.

It is an arithmetic number, because the mean of its divisors is an integer number (12683322).

Almost surely, 2^25366643 is an apocalyptic number.

25366643 is a deficient number, since it is larger than the sum of its proper divisors (1).

25366643 is an equidigital number, since it uses as much as digits as its factorization.

25366643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 35.

The square root of 25366643 is about 5036.5308497020. The cubic root of 25366643 is about 293.8242698579.

The spelling of 25366643 in words is "twenty-five million, three hundred sixty-six thousand, six hundred forty-three".