166721082 has 16 divisors (see below), whose sum is σ = 363755232. Its totient is φ = 50521520.

The previous prime is 166721081. The next prime is 166721099. The reversal of 166721082 is 280127661.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (166721081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1262973 + ... + 1263104.

It is an arithmetic number, because the mean of its divisors is an integer number (22734702).

Almost surely, 2^166721082 is an apocalyptic number.

166721082 is an abundant number, since it is smaller than the sum of its proper divisors (197034150).

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

166721082 is a wasteful number, since it uses less digits than its factorization.

166721082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526093.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 166721082 is about 12912.0518121637. The cubic root of 166721082 is about 550.3810934562.

The spelling of 166721082 in words is "one hundred sixty-six million, seven hundred twenty-one thousand, eighty-two".