166699980 has 36 divisors (see below), whose sum is σ = 505657152. Its totient is φ = 44453280.

The previous prime is 166699889. The next prime is 166699993. The reversal of 166699980 is 89996661.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 462876 + ... + 463235.

It is an arithmetic number, because the mean of its divisors is an integer number (14046032).

Almost surely, 2^166699980 is an apocalyptic number.

166699980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166699980 is an abundant number, since it is smaller than the sum of its proper divisors (338957172).

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

166699980 is a wasteful number, since it uses less digits than its factorization.

166699980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926126 (or 926121 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 166699980 is about 12911.2346427443. The cubic root of 166699980 is about 550.3578717741.

The spelling of 166699980 in words is "one hundred sixty-six million, six hundred ninety-nine thousand, nine hundred eighty".