164443866 has 16 divisors (see below), whose sum is σ = 336909888. Its totient is φ = 53477600.

The previous prime is 164443847. The next prime is 164443889. The reversal of 164443866 is 668344461.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333990 + ... + 334481.

It is an arithmetic number, because the mean of its divisors is an integer number (21056868).

Almost surely, 2^164443866 is an apocalyptic number.

164443866 is an abundant number, since it is smaller than the sum of its proper divisors (172466022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164443866 is a wasteful number, since it uses less digits than its factorization.

164443866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668517.

The product of its digits is 331776, while the sum is 42.

The square root of 164443866 is about 12823.5668205067. The cubic root of 164443866 is about 547.8637419411.

The spelling of 164443866 in words is "one hundred sixty-four million, four hundred forty-three thousand, eight hundred sixty-six".