165820903 has 2 divisors, whose sum is σ = 165820904. Its totient is φ = 165820902.

The previous prime is 165820901. The next prime is 165820909. The reversal of 165820903 is 309028561.

It is a weak prime.

It is an emirp because it is prime and its reverse (309028561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165820903 - 2¹ = 165820901 is a prime.

Together with 165820901, it forms a pair of twin primes.

It is equal to p_9282184 and since 165820903 and 9282184 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165820901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82910451 + 82910452.

It is an arithmetic number, because the mean of its divisors is an integer number (82910452).

Almost surely, 2^165820903 is an apocalyptic number.

165820903 is a deficient number, since it is larger than the sum of its proper divisors (1).

165820903 is an equidigital number, since it uses as much as digits as its factorization.

165820903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 165820903 is about 12877.1465395094. The cubic root of 165820903 is about 549.3887457145.

The spelling of 165820903 in words is "one hundred sixty-five million, eight hundred twenty thousand, nine hundred three".