66173884 has 48 divisors (see below), whose sum is σ = 140313600. Its totient is φ = 26675136.

The previous prime is 66173879. The next prime is 66173897. The reversal of 66173884 is 48837166.

It is a self number, because there is not a number n which added to its sum of digits gives 66173884.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91677 + ... + 92395.

It is an arithmetic number, because the mean of its divisors is an integer number (2923200).

Almost surely, 2^66173884 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 66173884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70156800).

66173884 is an abundant number, since it is smaller than the sum of its proper divisors (74139716).

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

66173884 is a wasteful number, since it uses less digits than its factorization.

66173884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 920 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 66173884 is about 8134.7331855446. The cubic root of 66173884 is about 404.4785933565.

It can be divided in two parts, 6617 and 3884, that added together give a palindrome (10501).

The spelling of 66173884 in words is "sixty-six million, one hundred seventy-three thousand, eight hundred eighty-four".