166638852 has 36 divisors (see below), whose sum is σ = 427002940. Its totient is φ = 54784512.

The previous prime is 166638839. The next prime is 166638853. The reversal of 166638852 is 258836661.

166638852 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 46867716 + 119771136 = 6846^2 + 10944^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 166638798 and 166638807.

It is not an unprimeable number, because it can be changed into a prime (166638853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29077 + ... + 34332.

Almost surely, 2^166638852 is an apocalyptic number.

166638852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166638852 is an abundant number, since it is smaller than the sum of its proper divisors (260364088).

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

166638852 is a wasteful number, since it uses less digits than its factorization.

166638852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63492 (or 63487 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 166638852 is about 12908.8671850012. The cubic root of 166638852 is about 550.2905924440.

The spelling of 166638852 in words is "one hundred sixty-six million, six hundred thirty-eight thousand, eight hundred fifty-two".