27843989837 has 2 divisors, whose sum is σ = 27843989838. Its totient is φ = 27843989836.

The previous prime is 27843989809. The next prime is 27843989839. The reversal of 27843989837 is 73898934872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26156916361 + 1687073476 = 161731^2 + 41074^2 .

It is a cyclic number.

It is not a de Polignac number, because 27843989837 - 2⁸ = 27843989581 is a prime.

Together with 27843989839, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27843989839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13921994918 + 13921994919.

It is an arithmetic number, because the mean of its divisors is an integer number (13921994919).

Almost surely, 2^27843989837 is an apocalyptic number.

It is an amenable number.

27843989837 is a deficient number, since it is larger than the sum of its proper divisors (1).

27843989837 is an equidigital number, since it uses as much as digits as its factorization.

27843989837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146313216, while the sum is 68.

The spelling of 27843989837 in words is "twenty-seven billion, eight hundred forty-three million, nine hundred eighty-nine thousand, eight hundred thirty-seven".