165787543 has 2 divisors, whose sum is σ = 165787544. Its totient is φ = 165787542.

The previous prime is 165787541. The next prime is 165787571. The reversal of 165787543 is 345787561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165787543 - 2¹ = 165787541 is a prime.

Together with 165787541, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 165787493 and 165787502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165787541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82893771 + 82893772.

It is an arithmetic number, because the mean of its divisors is an integer number (82893772).

Almost surely, 2^165787543 is an apocalyptic number.

165787543 is a deficient number, since it is larger than the sum of its proper divisors (1).

165787543 is an equidigital number, since it uses as much as digits as its factorization.

165787543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 46.

The square root of 165787543 is about 12875.8511563314. The cubic root of 165787543 is about 549.3519010678.

The spelling of 165787543 in words is "one hundred sixty-five million, seven hundred eighty-seven thousand, five hundred forty-three".