166982721 has 8 divisors (see below), whose sum is σ = 235740384. Its totient is φ = 104773440.

The previous prime is 166982719. The next prime is 166982731. The reversal of 166982721 is 127289661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166982721 - 2¹ = 166982719 is a prime.

It is a super-2 number, since 2×166982721² = 55766458225127682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166982731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1637035 + ... + 1637136.

It is an arithmetic number, because the mean of its divisors is an integer number (29467548).

Almost surely, 2^166982721 is an apocalyptic number.

It is an amenable number.

166982721 is a deficient number, since it is larger than the sum of its proper divisors (68757663).

166982721 is a wasteful number, since it uses less digits than its factorization.

166982721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3274191.

The product of its digits is 72576, while the sum is 42.

The square root of 166982721 is about 12922.1794214444. The cubic root of 166982721 is about 550.6688512985.

The spelling of 166982721 in words is "one hundred sixty-six million, nine hundred eighty-two thousand, seven hundred twenty-one".