163666366193 has 4 divisors (see below), whose sum is σ = 178545126768. Its totient is φ = 148787605620.

The previous prime is 163666366159. The next prime is 163666366223. The reversal of 163666366193 is 391663666361.

It is a happy number.

163666366193 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163666366193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163666369193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7439380271 + ... + 7439380292.

It is an arithmetic number, because the mean of its divisors is an integer number (44636281692).

Almost surely, 2^163666366193 is an apocalyptic number.

It is an amenable number.

163666366193 is a deficient number, since it is larger than the sum of its proper divisors (14878760575).

163666366193 is a wasteful number, since it uses less digits than its factorization.

163666366193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14878760574.

The product of its digits is 11337408, while the sum is 56.

Adding to 163666366193 its sum of digits (56), we get a square (163666366249 = 404557²).

The spelling of 163666366193 in words is "one hundred sixty-three billion, six hundred sixty-six million, three hundred sixty-six thousand, one hundred ninety-three".