25716689 has 2 divisors, whose sum is σ = 25716690. Its totient is φ = 25716688.

The previous prime is 25716683. The next prime is 25716749. The reversal of 25716689 is 98661752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 3579664 = 4705^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 25716689 - 2²⁰ = 24668113 is a prime.

It is a super-2 number, since 2×25716689² = 1322696186245442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25716683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12858344 + 12858345.

It is an arithmetic number, because the mean of its divisors is an integer number (12858345).

Almost surely, 2^25716689 is an apocalyptic number.

It is an amenable number.

25716689 is a deficient number, since it is larger than the sum of its proper divisors (1).

25716689 is an equidigital number, since it uses as much as digits as its factorization.

25716689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 25716689 is about 5071.1624900017. The cubic root of 25716689 is about 295.1696390964.

The spelling of 25716689 in words is "twenty-five million, seven hundred sixteen thousand, six hundred eighty-nine".