66106572656 has 40 divisors (see below), whose sum is σ = 130284005040. Its totient is φ = 32485167104.

The previous prime is 66106572613. The next prime is 66106572659. The reversal of 66106572656 is 65627560166.

66106572656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66106572659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6581270 + ... + 6591306.

It is an arithmetic number, because the mean of its divisors is an integer number (3257100126).

Almost surely, 2^66106572656 is an apocalyptic number.

It is an amenable number.

66106572656 is a deficient number, since it is larger than the sum of its proper divisors (64177432384).

66106572656 is a wasteful number, since it uses less digits than its factorization.

66106572656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17081 (or 17075 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 66106572656 in words is "sixty-six billion, one hundred six million, five hundred seventy-two thousand, six hundred fifty-six".