66884171064 has 32 divisors (see below), whose sum is σ = 167940618000. Its totient is φ = 22197364992.

The previous prime is 66884171059. The next prime is 66884171069. The reversal of 66884171064 is 46017148866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66884171059) and next prime (66884171069).

It is a junction number, because it is equal to n+sod(n) for n = 66884170998 and 66884171016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66884171069) 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, 6079309 + ... + 6090300.

Almost surely, 2^66884171064 is an apocalyptic number.

It is an amenable number.

66884171064 is an abundant number, since it is smaller than the sum of its proper divisors (101056446936).

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

66884171064 is a wasteful number, since it uses less digits than its factorization.

66884171064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12169847 (or 12169843 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 66884171064 in words is "sixty-six billion, eight hundred eighty-four million, one hundred seventy-one thousand, sixty-four".