166541172 has 24 divisors (see below), whose sum is σ = 444110016. Its totient is φ = 47583168.

The previous prime is 166541159. The next prime is 166541191. The reversal of 166541172 is 271145661.

It is a super-2 number, since 2×166541172² = 55471923942267168, which contains 22 as substring.

It is a congruent number.

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, 991233 + ... + 991400.

It is an arithmetic number, because the mean of its divisors is an integer number (18504584).

Almost surely, 2^166541172 is an apocalyptic number.

166541172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166541172 is an abundant number, since it is smaller than the sum of its proper divisors (277568844).

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

166541172 is a wasteful number, since it uses less digits than its factorization.

166541172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982647 (or 1982645 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 166541172 is about 12905.0831845440. The cubic root of 166541172 is about 550.1830487136.

The spelling of 166541172 in words is "one hundred sixty-six million, five hundred forty-one thousand, one hundred seventy-two".