66173880 has 64 divisors (see below), whose sum is σ = 199908000. Its totient is φ = 17523200.

The previous prime is 66173879. The next prime is 66173897. The reversal of 66173880 is 8837166.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 16030 + ... + 19730.

Almost surely, 2^66173880 is an apocalyptic number.

66173880 is a gapful number since it is divisible by the number (60) 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 66173880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99954000).

66173880 is an abundant number, since it is smaller than the sum of its proper divisors (133734120).

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

66173880 is a wasteful number, since it uses less digits than its factorization.

66173880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864 (or 3860 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 66173880 is about 8134.7329396852. The cubic root of 66173880 is about 404.4785852067.

The spelling of 66173880 in words is "sixty-six million, one hundred seventy-three thousand, eight hundred eighty".