166661500 has 24 divisors (see below), whose sum is σ = 363989808. Its totient is φ = 66664400.

The previous prime is 166661461. The next prime is 166661501. The reversal of 166661500 is 5166661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166661501) 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, 166162 + ... + 167161.

It is an arithmetic number, because the mean of its divisors is an integer number (15166242).

Almost surely, 2^166661500 is an apocalyptic number.

166661500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166661500 is an abundant number, since it is smaller than the sum of its proper divisors (197328308).

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

166661500 is a wasteful number, since it uses less digits than its factorization.

166661500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333342 (or 333330 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 166661500 is about 12909.7443816677. The cubic root of 166661500 is about 550.3155214379.

The spelling of 166661500 in words is "one hundred sixty-six million, six hundred sixty-one thousand, five hundred".