66664944 has 50 divisors (see below), whose sum is σ = 192951440. Its totient is φ = 22221216.

The previous prime is 66664919. The next prime is 66664951. The reversal of 66664944 is 44946666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 66664944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24424 + ... + 27015.

Almost surely, 2^66664944 is an apocalyptic number.

It is an amenable number.

66664944 is an abundant number, since it is smaller than the sum of its proper divisors (126286496).

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

66664944 is a wasteful number, since it uses less digits than its factorization.

66664944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51459 (or 51444 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 66664944 is about 8164.8603172375. The cubic root of 66664944 is about 405.4766404726.

The spelling of 66664944 in words is "sixty-six million, six hundred sixty-four thousand, nine hundred forty-four".