27993345173 has 4 divisors (see below), whose sum is σ = 27994181100. Its totient is φ = 27992509248.

The previous prime is 27993345097. The next prime is 27993345187. The reversal of 27993345173 is 37154339972.

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 2819397604 + 25173947569 = 53098^2 + 158663^2 .

It is a cyclic number.

It is not a de Polignac number, because 27993345173 - 2¹⁸ = 27993083029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27993345973) 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, 365540 + ... + 435437.

It is an arithmetic number, because the mean of its divisors is an integer number (6998545275).

Almost surely, 2^27993345173 is an apocalyptic number.

It is an amenable number.

27993345173 is a deficient number, since it is larger than the sum of its proper divisors (835927).

27993345173 is an equidigital number, since it uses as much as digits as its factorization.

27993345173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835926.

The product of its digits is 4286520, while the sum is 53.

The spelling of 27993345173 in words is "twenty-seven billion, nine hundred ninety-three million, three hundred forty-five thousand, one hundred seventy-three".