165541543 has 2 divisors, whose sum is σ = 165541544. Its totient is φ = 165541542.

The previous prime is 165541531. The next prime is 165541553. The reversal of 165541543 is 345145561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165541543 - 2⁹ = 165541031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165541499 and 165541508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165541553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82770771 + 82770772.

It is an arithmetic number, because the mean of its divisors is an integer number (82770772).

Almost surely, 2^165541543 is an apocalyptic number.

165541543 is a deficient number, since it is larger than the sum of its proper divisors (1).

165541543 is an equidigital number, since it uses as much as digits as its factorization.

165541543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 34.

The square root of 165541543 is about 12866.2948435049. The cubic root of 165541543 is about 549.0800522061.

The spelling of 165541543 in words is "one hundred sixty-five million, five hundred forty-one thousand, five hundred forty-three".