181993164023 has 16 divisors (see below), whose sum is σ = 201125852160. Its totient is φ = 163293343200.

The previous prime is 181993163983. The next prime is 181993164043. The reversal of 181993164023 is 320461399181.

It is a cyclic number.

It is not a de Polignac number, because 181993164023 - 2²⁶ = 181926055159 is a prime.

It is a super-2 number, since 2×181993164023² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181993164043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2387861 + ... + 2462897.

It is an arithmetic number, because the mean of its divisors is an integer number (12570365760).

Almost surely, 2^181993164023 is an apocalyptic number.

181993164023 is a deficient number, since it is larger than the sum of its proper divisors (19132688137).

181993164023 is a wasteful number, since it uses less digits than its factorization.

181993164023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77918.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 181993164023 in words is "one hundred eighty-one billion, nine hundred ninety-three million, one hundred sixty-four thousand, twenty-three".