166673640 has 128 divisors (see below), whose sum is σ = 596367360. Its totient is φ = 36436224.

The previous prime is 166673603. The next prime is 166673653. The reversal of 166673640 is 46376661.

It is a happy 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 31 ways as a sum of consecutive naturals, for example, 15007 + ... + 23633.

It is an arithmetic number, because the mean of its divisors is an integer number (4659120).

Almost surely, 2^166673640 is an apocalyptic number.

166673640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166673640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298183680).

166673640 is an abundant number, since it is smaller than the sum of its proper divisors (429693720).

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

166673640 is a wasteful number, since it uses less digits than its factorization.

166673640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8671 (or 8667 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 166673640 is about 12910.2145605718. The cubic root of 166673640 is about 550.3288831885.

The spelling of 166673640 in words is "one hundred sixty-six million, six hundred seventy-three thousand, six hundred forty".