166443795887 has 16 divisors (see below), whose sum is σ = 171077948640. Its totient is φ = 161871295872.

The previous prime is 166443795841. The next prime is 166443795907. The reversal of 166443795887 is 788597344661.

It is a happy number.

166443795887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166443795887 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 (166443795587) 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 15 ways as a sum of consecutive naturals, for example, 2724893 + ... + 2785305.

It is an arithmetic number, because the mean of its divisors is an integer number (10692371790).

Almost surely, 2^166443795887 is an apocalyptic number.

166443795887 is a deficient number, since it is larger than the sum of its proper divisors (4634152753).

166443795887 is a wasteful number, since it uses less digits than its factorization.

166443795887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60922.

The product of its digits is 243855360, while the sum is 68.

The spelling of 166443795887 in words is "one hundred sixty-six billion, four hundred forty-three million, seven hundred ninety-five thousand, eight hundred eighty-seven".