27730017217 has 4 divisors (see below), whose sum is σ = 31691448256. Its totient is φ = 23768586180.

The previous prime is 27730017179. The next prime is 27730017247. The reversal of 27730017217 is 71271003772.

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 not a de Polignac number, because 27730017217 - 2³¹ = 25582533569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27730017247) 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, 1980715509 + ... + 1980715522.

It is an arithmetic number, because the mean of its divisors is an integer number (7922862064).

Almost surely, 2^27730017217 is an apocalyptic number.

It is an amenable number.

27730017217 is a deficient number, since it is larger than the sum of its proper divisors (3961431039).

27730017217 is an equidigital number, since it uses as much as digits as its factorization.

27730017217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961431038.

The product of its (nonzero) digits is 28812, while the sum is 37.

The spelling of 27730017217 in words is "twenty-seven billion, seven hundred thirty million, seventeen thousand, two hundred seventeen".