165836381823 has 24 divisors (see below), whose sum is σ = 274749984288. Its totient is φ = 94421529792.

The previous prime is 165836381819. The next prime is 165836381827. The reversal of 165836381823 is 328183638561.

165836381823 is a `hidden beast` number, since 1 + 6 + 583 + 6 + 38 + 1 + 8 + 23 = 666.

It is an interprime number because it is at equal distance from previous prime (165836381819) and next prime (165836381827).

It is not a de Polignac number, because 165836381823 - 2² = 165836381819 is a prime.

It is a super-2 number, since 2×165836381823² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165836381823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165836381827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4734036 + ... + 4768937.

It is an arithmetic number, because the mean of its divisors is an integer number (11447916012).

Almost surely, 2^165836381823 is an apocalyptic number.

165836381823 is a deficient number, since it is larger than the sum of its proper divisors (108913602465).

165836381823 is a wasteful number, since it uses less digits than its factorization.

165836381823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503263 (or 9503260 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 165836381823 in words is "one hundred sixty-five billion, eight hundred thirty-six million, three hundred eighty-one thousand, eight hundred twenty-three".