166065431773 has 4 divisors (see below), whose sum is σ = 169598738880. Its totient is φ = 162532124668.

The previous prime is 166065431737. The next prime is 166065431813. The reversal of 166065431773 is 377134560661.

166065431773 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-166065431773 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166065431173) 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, 1766653483 + ... + 1766653576.

It is an arithmetic number, because the mean of its divisors is an integer number (42399684720).

Almost surely, 2^166065431773 is an apocalyptic number.

It is an amenable number.

166065431773 is a deficient number, since it is larger than the sum of its proper divisors (3533307107).

166065431773 is an equidigital number, since it uses as much as digits as its factorization.

166065431773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533307106.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 166065431773 in words is "one hundred sixty-six billion, sixty-five million, four hundred thirty-one thousand, seven hundred seventy-three".