66218844 has 24 divisors (see below), whose sum is σ = 154782208. Its totient is φ = 22034160.

The previous prime is 66218809. The next prime is 66218849. The reversal of 66218844 is 44881266.

It is a Smith number, since the sum of its digits (39) 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 (66218849) 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, 2739 + ... + 11829.

Almost surely, 2^66218844 is an apocalyptic number.

It is an amenable number.

66218844 is an abundant number, since it is smaller than the sum of its proper divisors (88563364).

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

66218844 is a wasteful number, since it uses less digits than its factorization.

66218844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9705 (or 9703 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 66218844 is about 8137.4961751143. The cubic root of 66218844 is about 404.5701765184.

The spelling of 66218844 in words is "sixty-six million, two hundred eighteen thousand, eight hundred forty-four".