166243545023 has 2 divisors, whose sum is σ = 166243545024. Its totient is φ = 166243545022.

The previous prime is 166243545019. The next prime is 166243545043. The reversal of 166243545023 is 320545342661.

It is a weak prime.

It is an emirp because it is prime and its reverse (320545342661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166243545023 - 2² = 166243545019 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166243545043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83121772511 + 83121772512.

It is an arithmetic number, because the mean of its divisors is an integer number (83121772512).

Almost surely, 2^166243545023 is an apocalyptic number.

166243545023 is a deficient number, since it is larger than the sum of its proper divisors (1).

166243545023 is an equidigital number, since it uses as much as digits as its factorization.

166243545023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 41.

Adding to 166243545023 its reverse (320545342661), we get a palindrome (486788887684).

The spelling of 166243545023 in words is "one hundred sixty-six billion, two hundred forty-three million, five hundred forty-five thousand, twenty-three".