166664438 has 16 divisors (see below), whose sum is σ = 253125600. Its totient is φ = 82296000.

The previous prime is 166664437. The next prime is 166664441. The reversal of 166664438 is 834466661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166664437) 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 7 ways as a sum of consecutive naturals, for example, 53138 + ... + 56186.

It is an arithmetic number, because the mean of its divisors is an integer number (15820350).

Almost surely, 2^166664438 is an apocalyptic number.

166664438 is a deficient number, since it is larger than the sum of its proper divisors (86461162).

166664438 is a wasteful number, since it uses less digits than its factorization.

166664438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383.

The product of its digits is 497664, while the sum is 44.

The square root of 166664438 is about 12909.8581711807. The cubic root of 166664438 is about 550.3187551731.

The spelling of 166664438 in words is "one hundred sixty-six million, six hundred sixty-four thousand, four hundred thirty-eight".