27138198287 has 2 divisors, whose sum is σ = 27138198288. Its totient is φ = 27138198286.

The previous prime is 27138198277. The next prime is 27138198301. The reversal of 27138198287 is 78289183172.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27138198287 - 2⁴ = 27138198271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27138198277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13569099143 + 13569099144.

It is an arithmetic number, because the mean of its divisors is an integer number (13569099144).

Almost surely, 2^27138198287 is an apocalyptic number.

27138198287 is a deficient number, since it is larger than the sum of its proper divisors (1).

27138198287 is an equidigital number, since it uses as much as digits as its factorization.

27138198287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 56.

The spelling of 27138198287 in words is "twenty-seven billion, one hundred thirty-eight million, one hundred ninety-eight thousand, two hundred eighty-seven".