25667663 has 4 divisors (see below), whose sum is σ = 29334480. Its totient is φ = 22000848.

The previous prime is 25667627. The next prime is 25667683. The reversal of 25667663 is 36676652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25667663 - 2¹⁰ = 25666639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25667663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25667683) 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, 1833398 + ... + 1833411.

It is an arithmetic number, because the mean of its divisors is an integer number (7333620).

Almost surely, 2^25667663 is an apocalyptic number.

25667663 is a deficient number, since it is larger than the sum of its proper divisors (3666817).

25667663 is an equidigital number, since it uses as much as digits as its factorization.

25667663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3666816.

The product of its digits is 272160, while the sum is 41.

The square root of 25667663 is about 5066.3263811168. The cubic root of 25667663 is about 294.9819504422.

It can be divided in two parts, 2 and 5667663, that added together give a palindrome (5667665).

The spelling of 25667663 in words is "twenty-five million, six hundred sixty-seven thousand, six hundred sixty-three".