25643455 has 4 divisors (see below), whose sum is σ = 30772152. Its totient is φ = 20514760.

The previous prime is 25643441. The next prime is 25643489. The reversal of 25643455 is 55434652.

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

It is not a de Polignac number, because 25643455 - 2⁹ = 25642943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25643455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564341 + ... + 2564350.

It is an arithmetic number, because the mean of its divisors is an integer number (7693038).

Almost surely, 2^25643455 is an apocalyptic number.

25643455 is a deficient number, since it is larger than the sum of its proper divisors (5128697).

25643455 is an equidigital number, since it uses as much as digits as its factorization.

25643455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128696.

The product of its digits is 72000, while the sum is 34.

The square root of 25643455 is about 5063.9367097151. The cubic root of 25643455 is about 294.8891856122.

The spelling of 25643455 in words is "twenty-five million, six hundred forty-three thousand, four hundred fifty-five".