66447884 has 6 divisors (see below), whose sum is σ = 116283804. Its totient is φ = 33223940.

The previous prime is 66447881. The next prime is 66447889. The reversal of 66447884 is 48874466.

It is not an unprimeable number, because it can be changed into a prime (66447881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305982 + ... + 8305989.

It is an arithmetic number, because the mean of its divisors is an integer number (19380634).

Almost surely, 2^66447884 is an apocalyptic number.

It is an amenable number.

66447884 is a deficient number, since it is larger than the sum of its proper divisors (49835920).

66447884 is a wasteful number, since it uses less digits than its factorization.

66447884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16611975 (or 16611973 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 47.

The square root of 66447884 is about 8151.5571518576. The cubic root of 66447884 is about 405.0360868114.

The spelling of 66447884 in words is "sixty-six million, four hundred forty-seven thousand, eight hundred eighty-four".