27771640361 has 4 divisors (see below), whose sum is σ = 27840896724. Its totient is φ = 27702384000.

The previous prime is 27771640357. The next prime is 27771640363. The reversal of 27771640361 is 16304617772.

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 25943222761 + 1828417600 = 161069^2 + 42760^2 .

It is a cyclic number.

It is not a de Polignac number, because 27771640361 - 2² = 27771640357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27771640363) 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, 34627580 + ... + 34628381.

It is an arithmetic number, because the mean of its divisors is an integer number (6960224181).

Almost surely, 2^27771640361 is an apocalyptic number.

It is an amenable number.

27771640361 is a deficient number, since it is larger than the sum of its proper divisors (69256363).

27771640361 is an equidigital number, since it uses as much as digits as its factorization.

27771640361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69256362.

The product of its (nonzero) digits is 296352, while the sum is 44.

The spelling of 27771640361 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred forty thousand, three hundred sixty-one".