66686363208 has 256 divisors, whose sum is σ = 198504345600. Its totient is φ = 20692869120.

The previous prime is 66686363189. The next prime is 66686363213. The reversal of 66686363208 is 80236368666.

It is a super-3 number, since 3×66686363208³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 104034568 + ... + 104035208.

It is an arithmetic number, because the mean of its divisors is an integer number (775407600).

Almost surely, 2^66686363208 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 66686363208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99252172800).

66686363208 is an abundant number, since it is smaller than the sum of its proper divisors (131817982392).

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

66686363208 is a wasteful number, since it uses less digits than its factorization.

66686363208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209 (or 1199 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 66686363208 in words is "sixty-six billion, six hundred eighty-six million, three hundred sixty-three thousand, two hundred eight".