166555234113643 has 4 divisors (see below), whose sum is σ = 166560096648528. Its totient is φ = 166550371578760.

The previous prime is 166555234113629. The next prime is 166555234113713. The reversal of 166555234113643 is 346311432555661.

166555234113643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166555234113643 - 2⁹ = 166555234113131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166555234113623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2431216063 + ... + 2431284568.

It is an arithmetic number, because the mean of its divisors is an integer number (41640024162132).

Almost surely, 2^{166555234113643} is an apocalyptic number.

166555234113643 is a deficient number, since it is larger than the sum of its proper divisors (4862534885).

166555234113643 is an equidigital number, since it uses as much as digits as its factorization.

166555234113643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862534884.

The product of its digits is 23328000, while the sum is 55.

The spelling of 166555234113643 in words is "one hundred sixty-six trillion, five hundred fifty-five billion, two hundred thirty-four million, one hundred thirteen thousand, six hundred forty-three".