1665413311 has 2 divisors, whose sum is σ = 1665413312. Its totient is φ = 1665413310.

The previous prime is 1665413297. The next prime is 1665413359. The reversal of 1665413311 is 1133145661.

It is a weak prime.

It is an emirp because it is prime and its reverse (1133145661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1665413311 - 2¹¹ = 1665411263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665413111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832706655 + 832706656.

It is an arithmetic number, because the mean of its divisors is an integer number (832706656).

Almost surely, 2^1665413311 is an apocalyptic number.

1665413311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665413311 is an equidigital number, since it uses as much as digits as its factorization.

1665413311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 1665413311 is about 40809.4757501245. The cubic root of 1665413311 is about 1185.3338234733. Note that the first 3 decimals are identical.

Adding to 1665413311 its reverse (1133145661), we get a palindrome (2798558972).

The spelling of 1665413311 in words is "one billion, six hundred sixty-five million, four hundred thirteen thousand, three hundred eleven".