166444118447 has 4 divisors (see below), whose sum is σ = 166484987760. Its totient is φ = 166403249136.

The previous prime is 166444118431. The next prime is 166444118461. The reversal of 166444118447 is 744811444661.

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 166444118447 - 2⁴ = 166444118431 is a prime.

It is a super-3 number, since 3×166444118447³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166444118395 and 166444118404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166444118417) 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, 20428547 + ... + 20436692.

It is an arithmetic number, because the mean of its divisors is an integer number (41621246940).

Almost surely, 2^166444118447 is an apocalyptic number.

166444118447 is a deficient number, since it is larger than the sum of its proper divisors (40869313).

166444118447 is an equidigital number, since it uses as much as digits as its factorization.

166444118447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40869312.

The product of its digits is 2064384, while the sum is 50.

The spelling of 166444118447 in words is "one hundred sixty-six billion, four hundred forty-four million, one hundred eighteen thousand, four hundred forty-seven".