166166444 has 24 divisors (see below), whose sum is σ = 303888480. Its totient is φ = 79352064.

The previous prime is 166166437. The next prime is 166166461. The reversal of 166166444 is 444661661.

It is a super-2 number, since 2×166166444² = 55222574223210272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 166166398 and 166166407.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 110852 + ... + 112340.

It is an arithmetic number, because the mean of its divisors is an integer number (12662020).

Almost surely, 2^166166444 is an apocalyptic number.

It is an amenable number.

166166444 is a deficient number, since it is larger than the sum of its proper divisors (137722036).

166166444 is a wasteful number, since it uses less digits than its factorization.

166166444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729 (or 2727 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 166166444 is about 12890.5563883023. The cubic root of 166166444 is about 549.7700901328.

The spelling of 166166444 in words is "one hundred sixty-six million, one hundred sixty-six thousand, four hundred forty-four".