27318978989 has 2 divisors, whose sum is σ = 27318978990. Its totient is φ = 27318978988.

The previous prime is 27318978977. The next prime is 27318979003. The reversal of 27318978989 is 98987981372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27005334889 + 313644100 = 164333^2 + 17710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27318978989 is a prime.

It is a super-2 number, since 2×27318978989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27318978689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13659489494 + 13659489495.

It is an arithmetic number, because the mean of its divisors is an integer number (13659489495).

Almost surely, 2^27318978989 is an apocalyptic number.

It is an amenable number.

27318978989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27318978989 is an equidigital number, since it uses as much as digits as its factorization.

27318978989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109734912, while the sum is 71.

The spelling of 27318978989 in words is "twenty-seven billion, three hundred eighteen million, nine hundred seventy-eight thousand, nine hundred eighty-nine".