166121444 has 12 divisors (see below), whose sum is σ = 290803968. Its totient is φ = 83034600.

The previous prime is 166121443. The next prime is 166121471. The reversal of 166121444 is 444121661.

166121444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (166121443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18089 + ... + 25679.

It is an arithmetic number, because the mean of its divisors is an integer number (24233664).

Almost surely, 2^166121444 is an apocalyptic number.

It is an amenable number.

166121444 is a deficient number, since it is larger than the sum of its proper divisors (124682524).

166121444 is a wasteful number, since it uses less digits than its factorization.

166121444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13066 (or 13064 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 166121444 is about 12888.8108062769. The cubic root of 166121444 is about 549.7204573930.

The spelling of 166121444 in words is "one hundred sixty-six million, one hundred twenty-one thousand, four hundred forty-four".