66323646 has 12 divisors (see below), whose sum is σ = 143701272. Its totient is φ = 22107876.

The previous prime is 66323641. The next prime is 66323669. The reversal of 66323646 is 64632366.

66323646 is a `hidden beast` number, since 6 + 6 + 3 + 2 + 3 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66323646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66323641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1842306 + ... + 1842341.

It is an arithmetic number, because the mean of its divisors is an integer number (11975106).

Almost surely, 2^66323646 is an apocalyptic number.

66323646 is an abundant number, since it is smaller than the sum of its proper divisors (77377626).

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

66323646 is a wasteful number, since it uses less digits than its factorization.

66323646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684655 (or 3684652 counting only the distinct ones).

The product of its digits is 93312, while the sum is 36.

The square root of 66323646 is about 8143.9330792928. The cubic root of 66323646 is about 404.7834965372.

The spelling of 66323646 in words is "sixty-six million, three hundred twenty-three thousand, six hundred forty-six".