25505663 has 4 divisors (see below), whose sum is σ = 25516848. Its totient is φ = 25494480.

The previous prime is 25505647. The next prime is 25505677. The reversal of 25505663 is 36650552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25505663 - 2⁴ = 25505647 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 (25505633) 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, 806 + ... + 7187.

It is an arithmetic number, because the mean of its divisors is an integer number (6379212).

Almost surely, 2^25505663 is an apocalyptic number.

25505663 is a deficient number, since it is larger than the sum of its proper divisors (11185).

25505663 is an equidigital number, since it uses as much as digits as its factorization.

25505663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11184.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 25505663 is about 5050.3131586071. The cubic root of 25505663 is about 294.3600529582.

The spelling of 25505663 in words is "twenty-five million, five hundred five thousand, six hundred sixty-three".