25555663 has 4 divisors (see below), whose sum is σ = 29206480. Its totient is φ = 21904848.

The previous prime is 25555661. The next prime is 25555667. The reversal of 25555663 is 36655552.

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

It is not a de Polignac number, because 25555663 - 2¹ = 25555661 is a prime.

It is a super-2 number, since 2×25555663² = 1306183822739138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1825398 + ... + 1825411.

It is an arithmetic number, because the mean of its divisors is an integer number (7301620).

Almost surely, 2^25555663 is an apocalyptic number.

25555663 is a deficient number, since it is larger than the sum of its proper divisors (3650817).

25555663 is an equidigital number, since it uses as much as digits as its factorization.

25555663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3650816.

The product of its digits is 135000, while the sum is 37.

The square root of 25555663 is about 5055.2609230385. The cubic root of 25555663 is about 294.5522768790.

The spelling of 25555663 in words is "twenty-five million, five hundred fifty-five thousand, six hundred sixty-three".