27775732613 has 4 divisors (see below), whose sum is σ = 28453189548. Its totient is φ = 27098275680.

The previous prime is 27775732603. The next prime is 27775732639. The reversal of 27775732613 is 31623757772.

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 2385540964 + 25390191649 = 48842^2 + 159343^2 .

It is a cyclic number.

It is not a de Polignac number, because 27775732613 - 2¹⁰ = 27775731589 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 (27775732603) 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, 338728406 + ... + 338728487.

It is an arithmetic number, because the mean of its divisors is an integer number (7113297387).

Almost surely, 2^27775732613 is an apocalyptic number.

It is an amenable number.

27775732613 is a deficient number, since it is larger than the sum of its proper divisors (677456935).

27775732613 is an equidigital number, since it uses as much as digits as its factorization.

27775732613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677456934.

The product of its digits is 2593080, while the sum is 50.

The spelling of 27775732613 in words is "twenty-seven billion, seven hundred seventy-five million, seven hundred thirty-two thousand, six hundred thirteen".