166021140 has 24 divisors (see below), whose sum is σ = 464859360. Its totient is φ = 44272288.

The previous prime is 166021139. The next prime is 166021157. The reversal of 166021140 is 41120661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1383450 + ... + 1383569.

It is an arithmetic number, because the mean of its divisors is an integer number (19369140).

Almost surely, 2^166021140 is an apocalyptic number.

166021140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166021140 is an abundant number, since it is smaller than the sum of its proper divisors (298838220).

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

166021140 is a wasteful number, since it uses less digits than its factorization.

166021140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2767031 (or 2767029 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 166021140 is about 12884.9190917134. The cubic root of 166021140 is about 549.6097948543.

The spelling of 166021140 in words is "one hundred sixty-six million, twenty-one thousand, one hundred forty".