166859220 has 48 divisors (see below), whose sum is σ = 509681088. Its totient is φ = 40450560.

The previous prime is 166859201. The next prime is 166859261. The reversal of 166859220 is 22958661.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 125749 + ... + 127068.

It is an arithmetic number, because the mean of its divisors is an integer number (10618356).

Almost surely, 2^166859220 is an apocalyptic number.

166859220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166859220 is an abundant number, since it is smaller than the sum of its proper divisors (342821868).

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

166859220 is a wasteful number, since it uses less digits than its factorization.

166859220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252840 (or 252838 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 166859220 is about 12917.3998931674. The cubic root of 166859220 is about 550.5330589509.

The spelling of 166859220 in words is "one hundred sixty-six million, eight hundred fifty-nine thousand, two hundred twenty".