66385644 has 24 divisors (see below), whose sum is σ = 166815600. Its totient is φ = 20426304.

The previous prime is 66385643. The next prime is 66385681. The reversal of 66385644 is 44658366.

It is a junction number, because it is equal to n+sod(n) for n = 66385596 and 66385605.

It is not an unprimeable number, because it can be changed into a prime (66385643) 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, 212619 + ... + 212930.

It is an arithmetic number, because the mean of its divisors is an integer number (6950650).

Almost surely, 2^66385644 is an apocalyptic number.

It is an amenable number.

66385644 is an abundant number, since it is smaller than the sum of its proper divisors (100429956).

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

66385644 is a wasteful number, since it uses less digits than its factorization.

66385644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425569 (or 425567 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 66385644 is about 8147.7385819625. The cubic root of 66385644 is about 404.9095850598.

The spelling of 66385644 in words is "sixty-six million, three hundred eighty-five thousand, six hundred forty-four".