1605166943 has 2 divisors, whose sum is σ = 1605166944. Its totient is φ = 1605166942.

The previous prime is 1605166931. The next prime is 1605167051. The reversal of 1605166943 is 3496615061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1605166943 - 2¹⁴ = 1605150559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1605166943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605166543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802583471 + 802583472.

It is an arithmetic number, because the mean of its divisors is an integer number (802583472).

Almost surely, 2^1605166943 is an apocalyptic number.

1605166943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605166943 is an equidigital number, since it uses as much as digits as its factorization.

1605166943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 1605166943 is about 40064.5347283604. The cubic root of 1605166943 is about 1170.8647618597.

The spelling of 1605166943 in words is "one billion, six hundred five million, one hundred sixty-six thousand, nine hundred forty-three".