66181384 has 8 divisors (see below), whose sum is σ = 124090110. Its totient is φ = 33090688.

The previous prime is 66181363. The next prime is 66181387. The reversal of 66181384 is 48318166.

66181384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 25502500 = 6378^2 + 5050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66181387) 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 as a sum of consecutive naturals, namely, 4136329 + ... + 4136344.

Almost surely, 2^66181384 is an apocalyptic number.

It is an amenable number.

66181384 is a deficient number, since it is larger than the sum of its proper divisors (57908726).

66181384 is a wasteful number, since it uses less digits than its factorization.

66181384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272679 (or 8272675 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 66181384 is about 8135.1941587156. The cubic root of 66181384 is about 404.4938736790.

The spelling of 66181384 in words is "sixty-six million, one hundred eighty-one thousand, three hundred eighty-four".