66173868 has 48 divisors (see below), whose sum is σ = 172480000. Its totient is φ = 21939984.

The previous prime is 66173857. The next prime is 66173873. The reversal of 66173868 is 86837166.

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, 19953 + ... + 23031.

Almost surely, 2^66173868 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 66173868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86240000).

66173868 is an abundant number, since it is smaller than the sum of its proper divisors (106306132).

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

66173868 is a wasteful number, since it uses less digits than its factorization.

66173868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291 (or 3283 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 66173868 is about 8134.7322021072. The cubic root of 66173868 is about 404.4785607573.

It can be divided in two parts, 661 and 73868, that added together give a square (74529 = 273²).

The spelling of 66173868 in words is "sixty-six million, one hundred seventy-three thousand, eight hundred sixty-eight".