1664664683443 has 2 divisors, whose sum is σ = 1664664683444. Its totient is φ = 1664664683442.

The previous prime is 1664664683413. The next prime is 1664664683459. The reversal of 1664664683443 is 3443864664661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664664683443 - 2²⁹ = 1664127812531 is a prime.

It is a super-2 number, since 2×1664664683443² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1664664683413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832332341721 + 832332341722.

It is an arithmetic number, because the mean of its divisors is an integer number (832332341722).

Almost surely, 2^{1664664683443} is an apocalyptic number.

1664664683443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664664683443 is an equidigital number, since it uses as much as digits as its factorization.

1664664683443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 143327232, while the sum is 61.

The spelling of 1664664683443 in words is "one trillion, six hundred sixty-four billion, six hundred sixty-four million, six hundred eighty-three thousand, four hundred forty-three".