66644084 has 24 divisors (see below), whose sum is σ = 127196160. Its totient is φ = 30367584.

The previous prime is 66644069. The next prime is 66644089. The reversal of 66644084 is 48044666.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4004 + ... + 12219.

It is an arithmetic number, because the mean of its divisors is an integer number (5299840).

Almost surely, 2^66644084 is an apocalyptic number.

It is an amenable number.

66644084 is a deficient number, since it is larger than the sum of its proper divisors (60552076).

66644084 is a wasteful number, since it uses less digits than its factorization.

66644084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16319 (or 16317 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 66644084 is about 8163.5827918874. The cubic root of 66644084 is about 405.4343437542.

The spelling of 66644084 in words is "sixty-six million, six hundred forty-four thousand, eighty-four".