66653336666 has 16 divisors (see below), whose sum is σ = 114285840000. Its totient is φ = 28559971440.

The previous prime is 66653336639. The next prime is 66653336683. The reversal of 66653336666 is 66663335666.

66653336666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66653336666² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406205 + ... + 546176.

It is an arithmetic number, because the mean of its divisors is an integer number (7142865000).

Almost surely, 2^66653336666 is an apocalyptic number.

66653336666 is a deficient number, since it is larger than the sum of its proper divisors (47632503334).

66653336666 is a wasteful number, since it uses less digits than its factorization.

66653336666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957389.

The product of its digits is 37791360, while the sum is 56.

The spelling of 66653336666 in words is "sixty-six billion, six hundred fifty-three million, three hundred thirty-six thousand, six hundred sixty-six".