27664071613 has 4 divisors (see below), whose sum is σ = 27669684508. Its totient is φ = 27658458720.

The previous prime is 27664071577. The next prime is 27664071619. The reversal of 27664071613 is 31617046672.

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 2409140889 + 25254930724 = 49083^2 + 158918^2 .

It is a cyclic number.

It is not a de Polignac number, because 27664071613 - 2⁹ = 27664071101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27664071613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27664071619) 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, 2799048 + ... + 2808913.

It is an arithmetic number, because the mean of its divisors is an integer number (6917421127).

Almost surely, 2^27664071613 is an apocalyptic number.

It is an amenable number.

27664071613 is a deficient number, since it is larger than the sum of its proper divisors (5612895).

27664071613 is an equidigital number, since it uses as much as digits as its factorization.

27664071613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5612894.

The product of its (nonzero) digits is 254016, while the sum is 43.

The spelling of 27664071613 in words is "twenty-seven billion, six hundred sixty-four million, seventy-one thousand, six hundred thirteen".