165544243 has 2 divisors, whose sum is σ = 165544244. Its totient is φ = 165544242.

The previous prime is 165544241. The next prime is 165544277. The reversal of 165544243 is 342445561.

It is an a-pointer prime, because the next prime (165544277) can be obtained adding 165544243 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165544243 - 2¹ = 165544241 is a prime.

Together with 165544241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 165544199 and 165544208.

It is not a weakly prime, because it can be changed into another prime (165544241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82772121 + 82772122.

It is an arithmetic number, because the mean of its divisors is an integer number (82772122).

Almost surely, 2^165544243 is an apocalyptic number.

165544243 is a deficient number, since it is larger than the sum of its proper divisors (1).

165544243 is an equidigital number, since it uses as much as digits as its factorization.

165544243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 34.

The square root of 165544243 is about 12866.3997683890. The cubic root of 165544243 is about 549.0830373744.

The spelling of 165544243 in words is "one hundred sixty-five million, five hundred forty-four thousand, two hundred forty-three".