166621882 has 16 divisors (see below), whose sum is σ = 285926400. Its totient is φ = 71337168.

The previous prime is 166621837. The next prime is 166621883. The reversal of 166621882 is 288126661.

It is a super-2 number, since 2×166621882² = 55525703122443848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166621883) by changing a digit.

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, 9744 + ... + 20692.

It is an arithmetic number, because the mean of its divisors is an integer number (17870400).

Almost surely, 2^166621882 is an apocalyptic number.

166621882 is a deficient number, since it is larger than the sum of its proper divisors (119304518).

166621882 is a wasteful number, since it uses less digits than its factorization.

166621882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12045.

The product of its digits is 55296, while the sum is 40.

The square root of 166621882 is about 12908.2098681421. The cubic root of 166621882 is about 550.2719118297.

The spelling of 166621882 in words is "one hundred sixty-six million, six hundred twenty-one thousand, eight hundred eighty-two".