166581330 has 16 divisors (see below), whose sum is σ = 399795264. Its totient is φ = 44421680.

The previous prime is 166581329. The next prime is 166581347. The reversal of 166581330 is 33185661.

It is a junction number, because it is equal to n+sod(n) for n = 166581291 and 166581300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2776326 + ... + 2776385.

It is an arithmetic number, because the mean of its divisors is an integer number (24987204).

Almost surely, 2^166581330 is an apocalyptic number.

166581330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166581330 is an abundant number, since it is smaller than the sum of its proper divisors (233213934).

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

166581330 is a wasteful number, since it uses less digits than its factorization.

166581330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552721.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 166581330 is about 12906.6389892954. The cubic root of 166581330 is about 550.2272669590.

The spelling of 166581330 in words is "one hundred sixty-six million, five hundred eighty-one thousand, three hundred thirty".