1366218979 has 2 divisors, whose sum is σ = 1366218980. Its totient is φ = 1366218978.

The previous prime is 1366218977. The next prime is 1366219009. The reversal of 1366218979 is 9798126631.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1366218979 - 2¹ = 1366218977 is a prime.

Together with 1366218977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1366218977) 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, 683109489 + 683109490.

It is an arithmetic number, because the mean of its divisors is an integer number (683109490).

Almost surely, 2^1366218979 is an apocalyptic number.

1366218979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366218979 is an equidigital number, since it uses as much as digits as its factorization.

1366218979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 1366218979 is about 36962.3995297924. The cubic root of 1366218979 is about 1109.6178591485.

The spelling of 1366218979 in words is "one billion, three hundred sixty-six million, two hundred eighteen thousand, nine hundred seventy-nine".