27866386945 has 4 divisors (see below), whose sum is σ = 33439664340. Its totient is φ = 22293109552.

The previous prime is 27866386939. The next prime is 27866386957. The reversal of 27866386945 is 54968366872.

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 3720024064 + 24146362881 = 60992^2 + 155391^2 .

It is a cyclic number.

It is not a de Polignac number, because 27866386945 - 2¹⁷ = 27866255873 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, 2786638690 + ... + 2786638699.

It is an arithmetic number, because the mean of its divisors is an integer number (8359916085).

Almost surely, 2^27866386945 is an apocalyptic number.

It is an amenable number.

27866386945 is a deficient number, since it is larger than the sum of its proper divisors (5573277395).

27866386945 is an equidigital number, since it uses as much as digits as its factorization.

27866386945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573277394.

The product of its digits is 104509440, while the sum is 64.

The spelling of 27866386945 in words is "twenty-seven billion, eight hundred sixty-six million, three hundred eighty-six thousand, nine hundred forty-five".