1366671689 has 2 divisors, whose sum is σ = 1366671690. Its totient is φ = 1366671688.

The previous prime is 1366671641. The next prime is 1366671791. The reversal of 1366671689 is 9861766631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1332250000 + 34421689 = 36500^2 + 5867^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366671689 - 2²⁰ = 1365623113 is a prime.

It is a super-2 number, since 2×1366671689² = 3735583011028225442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1366671689.

It is not a weakly prime, because it can be changed into another prime (1366671289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683335844 + 683335845.

It is an arithmetic number, because the mean of its divisors is an integer number (683335845).

Almost surely, 2^1366671689 is an apocalyptic number.

It is an amenable number.

1366671689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366671689 is an equidigital number, since it uses as much as digits as its factorization.

1366671689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 1366671689 is about 36968.5229485842. The cubic root of 1366671689 is about 1109.7404065181.

The spelling of 1366671689 in words is "one billion, three hundred sixty-six million, six hundred seventy-one thousand, six hundred eighty-nine".