166500180023 has 4 divisors (see below), whose sum is σ = 166501188480. Its totient is φ = 166499171568.

The previous prime is 166500180001. The next prime is 166500180031. The reversal of 166500180023 is 320081005661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 166500180023 - 2¹⁴ = 166500163639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166500180053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192215 + ... + 608232.

It is an arithmetic number, because the mean of its divisors is an integer number (41625297120).

Almost surely, 2^166500180023 is an apocalyptic number.

166500180023 is a deficient number, since it is larger than the sum of its proper divisors (1008457).

166500180023 is an equidigital number, since it uses as much as digits as its factorization.

166500180023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008456.

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 166500180023 its reverse (320081005661), we get a palindrome (486581185684).

The spelling of 166500180023 in words is "one hundred sixty-six billion, five hundred million, one hundred eighty thousand, twenty-three".