166191804 has 48 divisors (see below), whose sum is σ = 432579840. Its totient is φ = 55177200.

The previous prime is 166191799. The next prime is 166191811. The reversal of 166191804 is 408191661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 15 ways as a sum of consecutive naturals, for example, 25479 + ... + 31329.

It is an arithmetic number, because the mean of its divisors is an integer number (9012080).

Almost surely, 2^166191804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166191804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216289920).

166191804 is an abundant number, since it is smaller than the sum of its proper divisors (266388036).

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

166191804 is a wasteful number, since it uses less digits than its factorization.

166191804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127 (or 6119 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 166191804 is about 12891.5400166155. The cubic root of 166191804 is about 549.7980569913.

The spelling of 166191804 in words is "one hundred sixty-six million, one hundred ninety-one thousand, eight hundred four".