66566612318 has 8 divisors (see below), whose sum is σ = 99862027248. Its totient is φ = 33279269904.

The previous prime is 66566612317. The next prime is 66566612363. The reversal of 66566612318 is 81321666566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66566612318² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566612317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1997471 + ... + 2030522.

It is an arithmetic number, because the mean of its divisors is an integer number (12482753406).

Almost surely, 2^66566612318 is an apocalyptic number.

66566612318 is a deficient number, since it is larger than the sum of its proper divisors (33295414930).

66566612318 is a wasteful number, since it uses less digits than its factorization.

66566612318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036258.

The product of its digits is 1866240, while the sum is 50.

The spelling of 66566612318 in words is "sixty-six billion, five hundred sixty-six million, six hundred twelve thousand, three hundred eighteen".