166021110420 has 96 divisors (see below), whose sum is σ = 533809543680. Its totient is φ = 38129247360.

The previous prime is 166021110403. The next prime is 166021110461. The reversal of 166021110420 is 24011120661.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 6607122 + ... + 6632201.

It is an arithmetic number, because the mean of its divisors is an integer number (5560516080).

Almost surely, 2^166021110420 is an apocalyptic number.

166021110420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166021110420 is an abundant number, since it is smaller than the sum of its proper divisors (367788433260).

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

166021110420 is a wasteful number, since it uses less digits than its factorization.

166021110420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13239365 (or 13239363 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 166021110420 in words is "one hundred sixty-six billion, twenty-one million, one hundred ten thousand, four hundred twenty".