166664500 has 48 divisors (see below), whose sum is σ = 365693328. Its totient is φ = 66355200.

The previous prime is 166664441. The next prime is 166664501. The reversal of 166664500 is 5466661.

It can be written as a sum of positive squares in 8 ways, for example, as 1336336 + 165328164 = 1156^2 + 12858^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166664501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127852 + ... + 129148.

It is an arithmetic number, because the mean of its divisors is an integer number (7618611).

Almost surely, 2^166664500 is an apocalyptic number.

166664500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166664500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182846664).

166664500 is an abundant number, since it is smaller than the sum of its proper divisors (199028828).

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

166664500 is a wasteful number, since it uses less digits than its factorization.

166664500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573 (or 1561 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 166664500 is about 12909.8605724462. The cubic root of 166664500 is about 550.3188234135.

It can be divided in two parts, 1666 and 64500, that added together give a palindrome (66166).

The spelling of 166664500 in words is "one hundred sixty-six million, six hundred sixty-four thousand, five hundred".