1366218977 has 2 divisors, whose sum is σ = 1366218978. Its totient is φ = 1366218976.

The previous prime is 1366218947. The next prime is 1366218979. The reversal of 1366218977 is 7798126631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1354902481 + 11316496 = 36809^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366218977 - 2¹⁰ = 1366217953 is a prime.

It is a super-2 number, since 2×1366218977² = 3733108586229853058, which contains 22 as substring.

Together with 1366218979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1366218979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683109488 + 683109489.

It is an arithmetic number, because the mean of its divisors is an integer number (683109489).

Almost surely, 2^1366218977 is an apocalyptic number.

It is an amenable number.

1366218977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366218977 is an equidigital number, since it uses as much as digits as its factorization.

1366218977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 1366218977 is about 36962.3995027379. The cubic root of 1366218977 is about 1109.6178586070.

The spelling of 1366218977 in words is "one billion, three hundred sixty-six million, two hundred eighteen thousand, nine hundred seventy-seven".