66484619916 has 96 divisors (see below), whose sum is σ = 183955339008. Its totient is φ = 18423240960.

The previous prime is 66484619821. The next prime is 66484619917. The reversal of 66484619916 is 61991648466.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66484619916.

It is not an unprimeable number, because it can be changed into a prime (66484619917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2566 + ... + 364658.

It is an arithmetic number, because the mean of its divisors is an integer number (1916201448).

Almost surely, 2^66484619916 is an apocalyptic number.

66484619916 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66484619916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91977669504).

66484619916 is an abundant number, since it is smaller than the sum of its proper divisors (117470719092).

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

66484619916 is a wasteful number, since it uses less digits than its factorization.

66484619916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362231 (or 362229 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 60.

The spelling of 66484619916 in words is "sixty-six billion, four hundred eighty-four million, six hundred nineteen thousand, nine hundred sixteen".