27159768665 has 4 divisors (see below), whose sum is σ = 32591722404. Its totient is φ = 21727814928.

The previous prime is 27159768631. The next prime is 27159768679. The reversal of 27159768665 is 56686795172.

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 2934713929 + 24225054736 = 54173^2 + 155644^2 .

It is a cyclic number.

It is not a de Polignac number, because 27159768665 - 2²² = 27155574361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27159768598 and 27159768607.

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, 2715976862 + ... + 2715976871.

It is an arithmetic number, because the mean of its divisors is an integer number (8147930601).

Almost surely, 2^27159768665 is an apocalyptic number.

It is an amenable number.

27159768665 is a deficient number, since it is larger than the sum of its proper divisors (5431953739).

27159768665 is an equidigital number, since it uses as much as digits as its factorization.

27159768665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5431953738.

The product of its digits is 38102400, while the sum is 62.

The spelling of 27159768665 in words is "twenty-seven billion, one hundred fifty-nine million, seven hundred sixty-eight thousand, six hundred sixty-five".