166609424 has 40 divisors (see below), whose sum is σ = 340692480. Its totient is φ = 78771968.

The previous prime is 166609411. The next prime is 166609427. The reversal of 166609424 is 424906661.

It is a happy number.

It is a super-2 number, since 2×166609424² = 55517400331223552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166609427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30209 + ... + 35295.

It is an arithmetic number, because the mean of its divisors is an integer number (8517312).

Almost surely, 2^166609424 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 166609424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170346240).

166609424 is an abundant number, since it is smaller than the sum of its proper divisors (174083056).

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

166609424 is a wasteful number, since it uses less digits than its factorization.

166609424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207 (or 5201 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 166609424 is about 12907.7272980180. The cubic root of 166609424 is about 550.2581972278.

The spelling of 166609424 in words is "one hundred sixty-six million, six hundred nine thousand, four hundred twenty-four".