27408616813 has 4 divisors (see below), whose sum is σ = 27408963100. Its totient is φ = 27408270528.

The previous prime is 27408616777. The next prime is 27408616849. The reversal of 27408616813 is 31861680472.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (27408616777) and next prime (27408616849).

It can be written as a sum of positive squares in 2 ways, for example, as 3531568329 + 23877048484 = 59427^2 + 154522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27408616813 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 (27408616853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10531 + ... + 234367.

It is an arithmetic number, because the mean of its divisors is an integer number (6852240775).

Almost surely, 2^27408616813 is an apocalyptic number.

It is an amenable number.

27408616813 is a deficient number, since it is larger than the sum of its proper divisors (346287).

27408616813 is a wasteful number, since it uses less digits than its factorization.

27408616813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346286.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 27408616813 in words is "twenty-seven billion, four hundred eight million, six hundred sixteen thousand, eight hundred thirteen".