27189638243 has 2 divisors, whose sum is σ = 27189638244. Its totient is φ = 27189638242.

The previous prime is 27189638233. The next prime is 27189638369. The reversal of 27189638243 is 34283698172.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27189638243 - 2⁸ = 27189637987 is a prime.

It is not a weakly prime, because it can be changed into another prime (27189638233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13594819121 + 13594819122.

It is an arithmetic number, because the mean of its divisors is an integer number (13594819122).

Almost surely, 2^27189638243 is an apocalyptic number.

27189638243 is a deficient number, since it is larger than the sum of its proper divisors (1).

27189638243 is an equidigital number, since it uses as much as digits as its factorization.

27189638243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 53.

The spelling of 27189638243 in words is "twenty-seven billion, one hundred eighty-nine million, six hundred thirty-eight thousand, two hundred forty-three".