66647002000 has 80 divisors (see below), whose sum is σ = 161556271344. Its totient is φ = 26592000000.

The previous prime is 66647001923. The next prime is 66647002033. The reversal of 66647002000 is 20074666.

It can be written as a sum of positive squares in 8 ways, for example, as 3406823424 + 63240178576 = 58368^2 + 251476^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760450 + ... + 843550.

Almost surely, 2^66647002000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66647002000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80778135672).

66647002000 is an abundant number, since it is smaller than the sum of its proper divisors (94909269344).

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

66647002000 is a wasteful number, since it uses less digits than its factorization.

66647002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83525 (or 83509 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

Adding to 66647002000 its reverse (20074666), we get a palindrome (66667076666).

The spelling of 66647002000 in words is "sixty-six billion, six hundred forty-seven million, two thousand".