25385842666 has 8 divisors (see below), whose sum is σ = 38080528164. Its totient is φ = 12692333280.

The previous prime is 25385842663. The next prime is 25385842679. The reversal of 25385842666 is 66624858352.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22477505625 + 2908337041 = 149925^2 + 53929^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (25385842663) 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, 237925 + ... + 327688.

Almost surely, 2^25385842666 is an apocalyptic number.

25385842666 is a deficient number, since it is larger than the sum of its proper divisors (12694685498).

25385842666 is a wasteful number, since it uses less digits than its factorization.

25385842666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588056.

The product of its digits is 16588800, while the sum is 55.

The spelling of 25385842666 in words is "twenty-five billion, three hundred eighty-five million, eight hundred forty-two thousand, six hundred sixty-six".