66189876 has 12 divisors (see below), whose sum is σ = 154443072. Its totient is φ = 22063288.

The previous prime is 66189869. The next prime is 66189887. The reversal of 66189876 is 67898166.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×66189876³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2757900 + ... + 2757923.

It is an arithmetic number, because the mean of its divisors is an integer number (12870256).

Almost surely, 2^66189876 is an apocalyptic number.

It is an amenable number.

66189876 is an abundant number, since it is smaller than the sum of its proper divisors (88253196).

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

66189876 is a wasteful number, since it uses less digits than its factorization.

66189876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5515830 (or 5515828 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 66189876 is about 8135.7160717419. The cubic root of 66189876 is about 404.5111736852.

The spelling of 66189876 in words is "sixty-six million, one hundred eighty-nine thousand, eight hundred seventy-six".