27985458979 has 2 divisors, whose sum is σ = 27985458980. Its totient is φ = 27985458978.

The previous prime is 27985458937. The next prime is 27985458997. The reversal of 27985458979 is 97985458972.

Together with next prime (27985458997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27985458979 is a prime.

It is not a weakly prime, because it can be changed into another prime (27985458079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13992729489 + 13992729490.

It is an arithmetic number, because the mean of its divisors is an integer number (13992729490).

Almost surely, 2^27985458979 is an apocalyptic number.

27985458979 is a deficient number, since it is larger than the sum of its proper divisors (1).

27985458979 is an equidigital number, since it uses as much as digits as its factorization.

27985458979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 457228800, while the sum is 73.

It can be divided in two parts, 279854 and 58979, that added together give a palindrome (338833).

The spelling of 27985458979 in words is "twenty-seven billion, nine hundred eighty-five million, four hundred fifty-eight thousand, nine hundred seventy-nine".