66447018 has 24 divisors (see below), whose sum is σ = 157057056. Its totient is φ = 20135400.

The previous prime is 66447013. The next prime is 66447041. The reversal of 66447018 is 81074466.

66447018 is a `hidden beast` number, since 6 + 644 + 7 + 0 + 1 + 8 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66447011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167598 + ... + 167993.

It is an arithmetic number, because the mean of its divisors is an integer number (6544044).

Almost surely, 2^66447018 is an apocalyptic number.

66447018 is an abundant number, since it is smaller than the sum of its proper divisors (90610038).

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

66447018 is a wasteful number, since it uses less digits than its factorization.

66447018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335610 (or 335607 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 66447018 is about 8151.5040329991. The cubic root of 66447018 is about 405.0343272230.

The spelling of 66447018 in words is "sixty-six million, four hundred forty-seven thousand, eighteen".