66065501115666 has 96 divisors (see below), whose sum is σ = 154745115452928. Its totient is φ = 20249820944640.

The previous prime is 66065501115661. The next prime is 66065501115689. The reversal of 66065501115666 is 66651110556066.

It is not an unprimeable number, because it can be changed into a prime (66065501115661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123366015 + ... + 123900381.

It is an arithmetic number, because the mean of its divisors is an integer number (1611928285968).

Almost surely, 2^{66065501115666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66065501115666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77372557726464).

66065501115666 is an abundant number, since it is smaller than the sum of its proper divisors (88679614337262).

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

66065501115666 is a wasteful number, since it uses less digits than its factorization.

66065501115666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536416 (or 536413 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 66065501115666 in words is "sixty-six trillion, sixty-five billion, five hundred one million, one hundred fifteen thousand, six hundred sixty-six".