1605166543 has 2 divisors, whose sum is σ = 1605166544. Its totient is φ = 1605166542.

The previous prime is 1605166529. The next prime is 1605166547. The reversal of 1605166543 is 3456615061.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605166543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605166547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802583271 + 802583272.

It is an arithmetic number, because the mean of its divisors is an integer number (802583272).

Almost surely, 2^1605166543 is an apocalyptic number.

1605166543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605166543 is an equidigital number, since it uses as much as digits as its factorization.

1605166543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1605166543 is about 40064.5297364140. The cubic root of 1605166543 is about 1170.8646646018.

The spelling of 1605166543 in words is "one billion, six hundred five million, one hundred sixty-six thousand, five hundred forty-three".