66505665060 has 48 divisors (see below), whose sum is σ = 206906515200. Its totient is φ = 17734843872.

The previous prime is 66505665041. The next prime is 66505665067. The reversal of 66505665060 is 6056650566.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 66505664997 and 66505665015.

It is not an unprimeable number, because it can be changed into a prime (66505665067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61578780 + ... + 61579859.

It is an arithmetic number, because the mean of its divisors is an integer number (4310552400).

Almost surely, 2^66505665060 is an apocalyptic number.

66505665060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66505665060 is an abundant number, since it is smaller than the sum of its proper divisors (140400850140).

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

66505665060 is a wasteful number, since it uses less digits than its factorization.

66505665060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123158657 (or 123158649 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 66505665060 in words is "sixty-six billion, five hundred five million, six hundred sixty-five thousand, sixty".