27320391689 has 2 divisors, whose sum is σ = 27320391690. Its totient is φ = 27320391688.

The previous prime is 27320391587. The next prime is 27320391701. The reversal of 27320391689 is 98619302372.

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., 24026550025 + 3293841664 = 155005^2 + 57392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27320391689 is a prime.

It is not a weakly prime, because it can be changed into another prime (27320391089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13660195844 + 13660195845.

It is an arithmetic number, because the mean of its divisors is an integer number (13660195845).

Almost surely, 2^27320391689 is an apocalyptic number.

It is an amenable number.

27320391689 is a deficient number, since it is larger than the sum of its proper divisors (1).

27320391689 is an equidigital number, since it uses as much as digits as its factorization.

27320391689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 27320391689 in words is "twenty-seven billion, three hundred twenty million, three hundred ninety-one thousand, six hundred eighty-nine".