27610561361665 has 4 divisors (see below), whose sum is σ = 33132673634004. Its totient is φ = 22088449089328.

The previous prime is 27610561361659. The next prime is 27610561361671. The reversal of 27610561361665 is 56616316501672.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (27610561361659) and next prime (27610561361671).

It can be written as a sum of positive squares in 2 ways, for example, as 22073985303616 + 5536576058049 = 4698296^2 + 2352993^2 .

It is a cyclic number.

It is not a de Polignac number, because 27610561361665 - 2²⁹ = 27610024490753 is a prime.

It is a Duffinian 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, 2761056136162 + ... + 2761056136171.

It is an arithmetic number, because the mean of its divisors is an integer number (8283168408501).

Almost surely, 2^{27610561361665} is an apocalyptic number.

It is an amenable number.

27610561361665 is a deficient number, since it is larger than the sum of its proper divisors (5522112272339).

27610561361665 is an equidigital number, since it uses as much as digits as its factorization.

27610561361665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522112272338.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 27610561361665 in words is "twenty-seven trillion, six hundred ten billion, five hundred sixty-one million, three hundred sixty-one thousand, six hundred sixty-five".