25664663 has 8 divisors (see below), whose sum is σ = 26051040. Its totient is φ = 25280640.

The previous prime is 25664657. The next prime is 25664669. The reversal of 25664663 is 36646652.

It is an interprime number because it is at equal distance from previous prime (25664657) and next prime (25664669).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25664663 - 2⁶ = 25664599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40358 + ... + 40988.

It is an arithmetic number, because the mean of its divisors is an integer number (3256380).

Almost surely, 2^25664663 is an apocalyptic number.

25664663 is a deficient number, since it is larger than the sum of its proper divisors (386377).

25664663 is an equidigital number, since it uses as much as digits as its factorization.

25664663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177.

The product of its digits is 155520, while the sum is 38.

The square root of 25664663 is about 5066.0302999489. The cubic root of 25664663 is about 294.9704576372.

It can be divided in two parts, 2 and 5664663, that added together give a palindrome (5664665).

The spelling of 25664663 in words is "twenty-five million, six hundred sixty-four thousand, six hundred sixty-three".