166201650 has 72 divisors (see below), whose sum is σ = 448514820. Its totient is φ = 44123520.

The previous prime is 166201631. The next prime is 166201681. The reversal of 166201650 is 56102661.

It is a happy number.

166201650 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 0 + 1 + 650 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 72131049 + 94070601 = 8493^2 + 9699^2 .

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 35 ways as a sum of consecutive naturals, for example, 120364 + ... + 121736.

Almost surely, 2^166201650 is an apocalyptic number.

166201650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166201650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224257410).

166201650 is an abundant number, since it is smaller than the sum of its proper divisors (282313170).

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

166201650 is a wasteful number, since it uses less digits than its factorization.

166201650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660 (or 1652 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 166201650 is about 12891.9218893073. The cubic root of 166201650 is about 549.8089143353.

The spelling of 166201650 in words is "one hundred sixty-six million, two hundred one thousand, six hundred fifty".