66165665606 has 8 divisors (see below), whose sum is σ = 99249736104. Its totient is φ = 33082420240.

The previous prime is 66165665603. The next prime is 66165665653. The reversal of 66165665606 is 60656656166.

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

It is a super-2 number, since 2×66165665606² (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 (66165665603) 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, 66146 + ... + 369738.

It is an arithmetic number, because the mean of its divisors is an integer number (12406217013).

Almost surely, 2^66165665606 is an apocalyptic number.

66165665606 is a deficient number, since it is larger than the sum of its proper divisors (33084070498).

66165665606 is a wasteful number, since it uses less digits than its factorization.

66165665606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412566.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 66165665606 in words is "sixty-six billion, one hundred sixty-five million, six hundred sixty-five thousand, six hundred six".