27191694385 has 4 divisors (see below), whose sum is σ = 32630033268. Its totient is φ = 21753355504.

The previous prime is 27191694373. The next prime is 27191694389. The reversal of 27191694385 is 58349619172.

It is a happy number.

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 17190094321 + 10001600064 = 131111^2 + 100008^2 .

It is a cyclic number.

It is not a de Polignac number, because 27191694385 - 2¹⁵ = 27191661617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27191694389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2719169434 + ... + 2719169443.

It is an arithmetic number, because the mean of its divisors is an integer number (8157508317).

Almost surely, 2^27191694385 is an apocalyptic number.

It is an amenable number.

27191694385 is a deficient number, since it is larger than the sum of its proper divisors (5438338883).

27191694385 is an equidigital number, since it uses as much as digits as its factorization.

27191694385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438338882.

The product of its digits is 3265920, while the sum is 55.

The spelling of 27191694385 in words is "twenty-seven billion, one hundred ninety-one million, six hundred ninety-four thousand, three hundred eighty-five".