166720196 has 6 divisors (see below), whose sum is σ = 291760350. Its totient is φ = 83360096.

The previous prime is 166720181. The next prime is 166720219. The reversal of 166720196 is 691027661.

It can be written as a sum of positive squares in only one way, i.e., 165122500 + 1597696 = 12850^2 + 1264^2 .

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 as a sum of consecutive naturals, namely, 20840021 + ... + 20840028.

It is an arithmetic number, because the mean of its divisors is an integer number (48626725).

Almost surely, 2^166720196 is an apocalyptic number.

It is an amenable number.

166720196 is a deficient number, since it is larger than the sum of its proper divisors (125040154).

166720196 is a wasteful number, since it uses less digits than its factorization.

166720196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41680053 (or 41680051 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 166720196 is about 12912.0175030860. The cubic root of 166720196 is about 550.3801184975.

The spelling of 166720196 in words is "one hundred sixty-six million, seven hundred twenty thousand, one hundred ninety-six".