1366649959 has 4 divisors (see below), whose sum is σ = 1366759440. Its totient is φ = 1366540480.

The previous prime is 1366649953. The next prime is 1366650013. The reversal of 1366649959 is 9599466631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1366649959 - 2¹⁹ = 1366125671 is a prime.

It is a super-2 number, since 2×1366649959² = 3735464220869403362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366649953) 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 in 3 ways as a sum of consecutive naturals, for example, 33187 + ... + 61924.

It is an arithmetic number, because the mean of its divisors is an integer number (341689860).

Almost surely, 2^1366649959 is an apocalyptic number.

1366649959 is a deficient number, since it is larger than the sum of its proper divisors (109481).

1366649959 is an equidigital number, since it uses as much as digits as its factorization.

1366649959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109480.

The product of its digits is 9447840, while the sum is 58.

The square root of 1366649959 is about 36968.2290487386. The cubic root of 1366649959 is about 1109.7345248844.

The spelling of 1366649959 in words is "one billion, three hundred sixty-six million, six hundred forty-nine thousand, nine hundred fifty-nine".