166615220 has 48 divisors (see below), whose sum is σ = 368565120. Its totient is φ = 63144576.

The previous prime is 166615219. The next prime is 166615231. The reversal of 166615220 is 22516661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48479 + ... + 51801.

It is an arithmetic number, because the mean of its divisors is an integer number (7678440).

Almost surely, 2^166615220 is an apocalyptic number.

166615220 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 166615220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184282560).

166615220 is an abundant number, since it is smaller than the sum of its proper divisors (201949900).

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

166615220 is a wasteful number, since it uses less digits than its factorization.

166615220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464 (or 3462 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 166615220 is about 12907.9518127393. The cubic root of 166615220 is about 550.2645779383.

The spelling of 166615220 in words is "one hundred sixty-six million, six hundred fifteen thousand, two hundred twenty".