166601604 has 96 divisors (see below), whose sum is σ = 444810240. Its totient is φ = 48140928.

The previous prime is 166601593. The next prime is 166601609. The reversal of 166601604 is 406106661.

It is not an unprimeable number, because it can be changed into a prime (166601609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211299 + ... + 212085.

It is an arithmetic number, because the mean of its divisors is an integer number (4633440).

Almost surely, 2^166601604 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 166601604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222405120).

166601604 is an abundant number, since it is smaller than the sum of its proper divisors (278208636).

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

166601604 is a wasteful number, since it uses less digits than its factorization.

166601604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 166601604 is about 12907.4243751416. The cubic root of 166601604 is about 550.2495880981.

The spelling of 166601604 in words is "one hundred sixty-six million, six hundred one thousand, six hundred four".