166641624 has 96 divisors (see below), whose sum is σ = 488517120. Its totient is φ = 53117856.

The previous prime is 166641623. The next prime is 166641677. The reversal of 166641624 is 426146661.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166641623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42849 + ... + 46575.

It is an arithmetic number, because the mean of its divisors is an integer number (5088720).

Almost surely, 2^166641624 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 166641624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244258560).

166641624 is an abundant number, since it is smaller than the sum of its proper divisors (321875496).

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

166641624 is a wasteful number, since it uses less digits than its factorization.

166641624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3771 (or 3755 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 166641624 is about 12908.9745526126. The cubic root of 166641624 is about 550.2936437473.

The spelling of 166641624 in words is "one hundred sixty-six million, six hundred forty-one thousand, six hundred twenty-four".