166021632 has 120 divisors (see below), whose sum is σ = 547706016. Its totient is φ = 47425536.

The previous prime is 166021577. The next prime is 166021651. The reversal of 166021632 is 236120661.

166021632 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 21 + 632 = 666.

166021632 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 166021596 and 166021605.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29683 + ... + 34829.

Almost surely, 2^166021632 is an apocalyptic number.

166021632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166021632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273853008).

166021632 is an abundant number, since it is smaller than the sum of its proper divisors (381684384).

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

166021632 is an equidigital number, since it uses as much as digits as its factorization.

166021632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178 (or 5159 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 166021632 is about 12884.9381837865. The cubic root of 166021632 is about 549.6103377727.

The spelling of 166021632 in words is "one hundred sixty-six million, twenty-one thousand, six hundred thirty-two".