27273221161 has 4 divisors (see below), whose sum is σ = 27273912192. Its totient is φ = 27272530132.

The previous prime is 27273221117. The next prime is 27273221179. The reversal of 27273221161 is 16112237272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27273221161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27273201161) 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, 282481 + ... + 366526.

It is an arithmetic number, because the mean of its divisors is an integer number (6818478048).

Almost surely, 2^27273221161 is an apocalyptic number.

It is an amenable number.

27273221161 is a deficient number, since it is larger than the sum of its proper divisors (691031).

27273221161 is an equidigital number, since it uses as much as digits as its factorization.

27273221161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691030.

The product of its digits is 14112, while the sum is 34.

The spelling of 27273221161 in words is "twenty-seven billion, two hundred seventy-three million, two hundred twenty-one thousand, one hundred sixty-one".