66649353264 has 720 divisors, whose sum is σ = 230482560672. Its totient is φ = 17795137536.

The previous prime is 66649353233. The next prime is 66649353271. The reversal of 66649353264 is 46235394666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66649353264.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 622891099 + ... + 622891205.

Almost surely, 2^66649353264 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 66649353264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115241280336).

66649353264 is an abundant number, since it is smaller than the sum of its proper divisors (163833207408).

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

66649353264 is a wasteful number, since it uses less digits than its factorization.

66649353264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 202 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 54.

The spelling of 66649353264 in words is "sixty-six billion, six hundred forty-nine million, three hundred fifty-three thousand, two hundred sixty-four".