27189637987 has 2 divisors, whose sum is σ = 27189637988. Its totient is φ = 27189637986.

The previous prime is 27189637921. The next prime is 27189638011. The reversal of 27189637987 is 78973698172.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27189637987 - 2²³ = 27181249379 is a prime.

It is a super-2 number, since 2×27189637987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27189637187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13594818993 + 13594818994.

It is an arithmetic number, because the mean of its divisors is an integer number (13594818994).

Almost surely, 2^27189637987 is an apocalyptic number.

27189637987 is a deficient number, since it is larger than the sum of its proper divisors (1).

27189637987 is an equidigital number, since it uses as much as digits as its factorization.

27189637987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64012032, while the sum is 67.

The spelling of 27189637987 in words is "twenty-seven billion, one hundred eighty-nine million, six hundred thirty-seven thousand, nine hundred eighty-seven".