166166320 has 40 divisors (see below), whose sum is σ = 386912736. Its totient is φ = 66367488.

The previous prime is 166166281. The next prime is 166166339. The reversal of 166166320 is 23661661.

166166320 = T₁₆ + T₁₇ + ... + T₉₉₈.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×166166320² = 55222491804684800, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 77584 + ... + 79696.

Almost surely, 2^166166320 is an apocalyptic number.

166166320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166166320 is an abundant number, since it is smaller than the sum of its proper divisors (220746416).

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

166166320 is a wasteful number, since it uses less digits than its factorization.

166166320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109 (or 3103 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 166166320 is about 12890.5515785788. The cubic root of 166166320 is about 549.7699533794.

The spelling of 166166320 in words is "one hundred sixty-six million, one hundred sixty-six thousand, three hundred twenty".