27913916645 has 4 divisors (see below), whose sum is σ = 33496699980. Its totient is φ = 22331133312.

The previous prime is 27913916609. The next prime is 27913916659. The reversal of 27913916645 is 54661931972.

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 8201475844 + 19712440801 = 90562^2 + 140401^2 .

It is a cyclic number.

It is not a de Polignac number, because 27913916645 - 2¹⁸ = 27913654501 is a prime.

It is a Curzon number.

It is a congruent 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, 2791391660 + ... + 2791391669.

It is an arithmetic number, because the mean of its divisors is an integer number (8374174995).

Almost surely, 2^27913916645 is an apocalyptic number.

It is an amenable number.

27913916645 is a deficient number, since it is larger than the sum of its proper divisors (5582783335).

27913916645 is an equidigital number, since it uses as much as digits as its factorization.

27913916645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582783334.

The product of its digits is 2449440, while the sum is 53.

The spelling of 27913916645 in words is "twenty-seven billion, nine hundred thirteen million, nine hundred sixteen thousand, six hundred forty-five".