66660106556 has 12 divisors (see below), whose sum is σ = 120677779320. Its totient is φ = 32180741040.

The previous prime is 66660106553. The next prime is 66660106571. The reversal of 66660106556 is 65560106666.

It is a super-2 number, since 2×66660106556² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66660106556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660106553) 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, 287327930 + ... + 287328161.

It is an arithmetic number, because the mean of its divisors is an integer number (10056481610).

Almost surely, 2^66660106556 is an apocalyptic number.

It is an amenable number.

66660106556 is a deficient number, since it is larger than the sum of its proper divisors (54017672764).

66660106556 is a wasteful number, since it uses less digits than its factorization.

66660106556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574656124 (or 574656122 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 66660106556 in words is "sixty-six billion, six hundred sixty million, one hundred six thousand, five hundred fifty-six".