166666544 has 20 divisors (see below), whose sum is σ = 352272840. Its totient is φ = 75757440.

The previous prime is 166666481. The next prime is 166666547. The reversal of 166666544 is 445666661.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 166666495 and 166666504.

It is not an unprimeable number, because it can be changed into a prime (166666547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473309 + ... + 473660.

It is an arithmetic number, because the mean of its divisors is an integer number (17613642).

Almost surely, 2^166666544 is an apocalyptic number.

It is an amenable number.

166666544 is an abundant number, since it is smaller than the sum of its proper divisors (185606296).

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

166666544 is a wasteful number, since it uses less digits than its factorization.

166666544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946988 (or 946982 counting only the distinct ones).

The product of its digits is 622080, while the sum is 44.

The square root of 166666544 is about 12909.9397364976. The cubic root of 166666544 is about 550.3210731369.

The spelling of 166666544 in words is "one hundred sixty-six million, six hundred sixty-six thousand, five hundred forty-four".