1366765985 has 8 divisors (see below), whose sum is σ = 1766282280. Its totient is φ = 1009304064.

The previous prime is 1366765973. The next prime is 1366765991. The reversal of 1366765985 is 5895676631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28376929 + 1338389056 = 5327^2 + 36584^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1366765985 - 2¹⁰ = 1366764961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1366765985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10513520 + ... + 10513649.

It is an arithmetic number, because the mean of its divisors is an integer number (220785285).

Almost surely, 2^1366765985 is an apocalyptic number.

It is an amenable number.

1366765985 is a deficient number, since it is larger than the sum of its proper divisors (399516295).

1366765985 is a wasteful number, since it uses less digits than its factorization.

1366765985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21027187.

The product of its digits is 8164800, while the sum is 56.

The square root of 1366765985 is about 36969.7982818408. The cubic root of 1366765985 is about 1109.7659287840.

The spelling of 1366765985 in words is "one billion, three hundred sixty-six million, seven hundred sixty-five thousand, nine hundred eighty-five".