1366688689 has 2 divisors, whose sum is σ = 1366688690. Its totient is φ = 1366688688.

The previous prime is 1366688683. The next prime is 1366688747. The reversal of 1366688689 is 9868866631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1366559089 + 129600 = 36967^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366688689 - 2⁵ = 1366688657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1366688683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683344344 + 683344345.

It is an arithmetic number, because the mean of its divisors is an integer number (683344345).

Almost surely, 2^1366688689 is an apocalyptic number.

It is an amenable number.

1366688689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366688689 is an equidigital number, since it uses as much as digits as its factorization.

1366688689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17915904, while the sum is 61.

The square root of 1366688689 is about 36968.7528732036. The cubic root of 1366688689 is about 1109.7450078448.

The spelling of 1366688689 in words is "one billion, three hundred sixty-six million, six hundred eighty-eight thousand, six hundred eighty-nine".