27161676865 has 4 divisors (see below), whose sum is σ = 32594012244. Its totient is φ = 21729341488.

The previous prime is 27161676821. The next prime is 27161676887. The reversal of 27161676865 is 56867616172.

It is a Cunningham number, because it is equal to 164808²+1.

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 9778045456 + 17383631409 = 98884^2 + 131847^2 .

It is a cyclic number.

It is not a de Polignac number, because 27161676865 - 2²³ = 27153288257 is a prime.

It is a Duffinian number.

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, 2716167682 + ... + 2716167691.

It is an arithmetic number, because the mean of its divisors is an integer number (8148503061).

Almost surely, 2^27161676865 is an apocalyptic number.

It is an amenable number.

27161676865 is a deficient number, since it is larger than the sum of its proper divisors (5432335379).

27161676865 is an equidigital number, since it uses as much as digits as its factorization.

27161676865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432335378.

The product of its digits is 5080320, while the sum is 55.

The spelling of 27161676865 in words is "twenty-seven billion, one hundred sixty-one million, six hundred seventy-six thousand, eight hundred sixty-five".