66386479547680 has 192 divisors, whose sum is σ = 162567570291840. Its totient is φ = 25588178509824.

The previous prime is 66386479547623. The next prime is 66386479547711. The reversal of 66386479547680 is 8674597468366.

It is a self number, because there is not a number n which added to its sum of digits gives 66386479547680.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13446722172 + ... + 13446727108.

It is an arithmetic number, because the mean of its divisors is an integer number (846706095270).

Almost surely, 2^{66386479547680} 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 66386479547680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81283785145920).

66386479547680 is an abundant number, since it is smaller than the sum of its proper divisors (96181090744160).

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

66386479547680 is a wasteful number, since it uses less digits than its factorization.

66386479547680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10131 (or 10123 counting only the distinct ones).

The product of its (nonzero) digits is 8778792960, while the sum is 79.

The spelling of 66386479547680 in words is "sixty-six trillion, three hundred eighty-six billion, four hundred seventy-nine million, five hundred forty-seven thousand, six hundred eighty".