66989184 has 64 divisors (see below), whose sum is σ = 182123040. Its totient is φ = 21805056.

The previous prime is 66989183. The next prime is 66989189. The reversal of 66989184 is 48198966.

It is a happy number.

66989184 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66989183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14484 + ... + 18540.

Almost surely, 2^66989184 is an apocalyptic number.

66989184 is a gapful number since it is divisible by the number (64) 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 66989184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91061520).

66989184 is an abundant number, since it is smaller than the sum of its proper divisors (115133856).

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

66989184 is a wasteful number, since it uses less digits than its factorization.

66989184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117 (or 4105 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 66989184 is about 8184.6920528509. The cubic root of 66989184 is about 406.1329532941.

The spelling of 66989184 in words is "sixty-six million, nine hundred eighty-nine thousand, one hundred eighty-four".