165818383 has 2 divisors, whose sum is σ = 165818384. Its totient is φ = 165818382.

The previous prime is 165818371. The next prime is 165818399. The reversal of 165818383 is 383818561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165818383 - 2²¹ = 163721231 is a prime.

It is a super-2 number, since 2×165818383² = 54991472281469378, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165818333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82909191 + 82909192.

It is an arithmetic number, because the mean of its divisors is an integer number (82909192).

Almost surely, 2^165818383 is an apocalyptic number.

165818383 is a deficient number, since it is larger than the sum of its proper divisors (1).

165818383 is an equidigital number, since it uses as much as digits as its factorization.

165818383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 43.

The square root of 165818383 is about 12877.0486913733. The cubic root of 165818383 is about 549.3859626584.

It can be divided in two parts, 16581 and 8383, that added together give a square (24964 = 158²).

The spelling of 165818383 in words is "one hundred sixty-five million, eight hundred eighteen thousand, three hundred eighty-three".