6640066324 has 24 divisors (see below), whose sum is σ = 12057232040. Its totient is φ = 3196993536.

The previous prime is 6640066319. The next prime is 6640066327. The reversal of 6640066324 is 4236600466.

It can be written as a sum of positive squares in 4 ways, for example, as 1151923600 + 5488142724 = 33940^2 + 74082^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640066327) 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, 216909 + ... + 245620.

Almost surely, 2^6640066324 is an apocalyptic number.

It is an amenable number.

6640066324 is a deficient number, since it is larger than the sum of its proper divisors (5417165716).

6640066324 is a wasteful number, since it uses less digits than its factorization.

6640066324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462667 (or 462665 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 6640066324 is about 81486.6021134763. The cubic root of 6640066324 is about 1879.5655329963.

The spelling of 6640066324 in words is "six billion, six hundred forty million, sixty-six thousand, three hundred twenty-four".