166655216 has 80 divisors (see below), whose sum is σ = 420848064. Its totient is φ = 62042112.

The previous prime is 166655191. The next prime is 166655221. The reversal of 166655216 is 612556661.

It is a super-2 number, since 2×166655216² = 55547922040013312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166655216.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21386 + ... + 28118.

Almost surely, 2^166655216 is an apocalyptic number.

166655216 is a gapful number since it is divisible by the number (16) 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 166655216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210424032).

166655216 is an abundant number, since it is smaller than the sum of its proper divisors (254192848).

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

166655216 is a wasteful number, since it uses less digits than its factorization.

166655216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778 (or 6772 counting only the distinct ones).

The product of its digits is 64800, while the sum is 38.

The square root of 166655216 is about 12909.5009973275. The cubic root of 166655216 is about 550.3086047710.

The spelling of 166655216 in words is "one hundred sixty-six million, six hundred fifty-five thousand, two hundred sixteen".