25656564545 has 4 divisors (see below), whose sum is σ = 30787877460. Its totient is φ = 20525251632.

The previous prime is 25656564529. The next prime is 25656564551. The reversal of 25656564545 is 54546565652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15169370896 + 10487193649 = 123164^2 + 102407^2 .

It is a cyclic number.

It is not a de Polignac number, because 25656564545 - 2⁴ = 25656564529 is a prime.

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, 2565656450 + ... + 2565656459.

It is an arithmetic number, because the mean of its divisors is an integer number (7696969365).

Almost surely, 2^25656564545 is an apocalyptic number.

It is an amenable number.

25656564545 is a deficient number, since it is larger than the sum of its proper divisors (5131312915).

25656564545 is an equidigital number, since it uses as much as digits as its factorization.

25656564545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131312914.

The product of its digits is 21600000, while the sum is 53.

The spelling of 25656564545 in words is "twenty-five billion, six hundred fifty-six million, five hundred sixty-four thousand, five hundred forty-five".