1366413605 has 4 divisors (see below), whose sum is σ = 1639696332. Its totient is φ = 1093130880.

The previous prime is 1366413571. The next prime is 1366413649. The reversal of 1366413605 is 5063146631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 466473604 + 899940001 = 21598^2 + 29999^2 .

It is not a de Polignac number, because 1366413605 - 2⁶ = 1366413541 is a prime.

It is a super-2 number, since 2×1366413605² = 3734172279858192050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136641356 + ... + 136641365.

It is an arithmetic number, because the mean of its divisors is an integer number (409924083).

Almost surely, 2^1366413605 is an apocalyptic number.

It is an amenable number.

1366413605 is a deficient number, since it is larger than the sum of its proper divisors (273282727).

1366413605 is an equidigital number, since it uses as much as digits as its factorization.

1366413605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273282726.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 1366413605 is about 36965.0321926006. The cubic root of 1366413605 is about 1109.6705471959.

The spelling of 1366413605 in words is "one billion, three hundred sixty-six million, four hundred thirteen thousand, six hundred five".