1366165673 has 4 divisors (see below), whose sum is σ = 1366851780. Its totient is φ = 1365479568.

The previous prime is 1366165667. The next prime is 1366165739. The reversal of 1366165673 is 3765616631.

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 82591744 + 1283573929 = 9088^2 + 35827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366165673 - 2⁶ = 1366165609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1366165613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340058 + ... + 344051.

It is an arithmetic number, because the mean of its divisors is an integer number (341712945).

Almost surely, 2^1366165673 is an apocalyptic number.

It is an amenable number.

1366165673 is a deficient number, since it is larger than the sum of its proper divisors (686107).

1366165673 is an equidigital number, since it uses as much as digits as its factorization.

1366165673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686106.

The product of its digits is 408240, while the sum is 44.

The square root of 1366165673 is about 36961.6784386207. The cubic root of 1366165673 is about 1109.6034275774.

The spelling of 1366165673 in words is "one billion, three hundred sixty-six million, one hundred sixty-five thousand, six hundred seventy-three".