1664727343 has 2 divisors, whose sum is σ = 1664727344. Its totient is φ = 1664727342.

The previous prime is 1664727319. The next prime is 1664727367. The reversal of 1664727343 is 3437274661.

It is a balanced prime because it is at equal distance from previous prime (1664727319) and next prime (1664727367).

It is a cyclic number.

It is not a de Polignac number, because 1664727343 - 2¹³ = 1664719151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1664727343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664727943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832363671 + 832363672.

It is an arithmetic number, because the mean of its divisors is an integer number (832363672).

Almost surely, 2^1664727343 is an apocalyptic number.

1664727343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664727343 is an equidigital number, since it uses as much as digits as its factorization.

1664727343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 43.

The square root of 1664727343 is about 40801.0703658617. The cubic root of 1664727343 is about 1185.1710585251.

The spelling of 1664727343 in words is "one billion, six hundred sixty-four million, seven hundred twenty-seven thousand, three hundred forty-three".