25642555 has 4 divisors (see below), whose sum is σ = 30771072. Its totient is φ = 20514040.

The previous prime is 25642541. The next prime is 25642567. The reversal of 25642555 is 55524652.

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

It is not a de Polignac number, because 25642555 - 2⁵ = 25642523 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 25642555.

It is an unprimeable number.

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, 2564251 + ... + 2564260.

It is an arithmetic number, because the mean of its divisors is an integer number (7692768).

Almost surely, 2^25642555 is an apocalyptic number.

25642555 is a deficient number, since it is larger than the sum of its proper divisors (5128517).

25642555 is an equidigital number, since it uses as much as digits as its factorization.

25642555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128516.

The product of its digits is 60000, while the sum is 34.

The square root of 25642555 is about 5063.8478452655. The cubic root of 25642555 is about 294.8857356953.

The spelling of 25642555 in words is "twenty-five million, six hundred forty-two thousand, five hundred fifty-five".