66650405666 has 32 divisors (see below), whose sum is σ = 117676758528. Its totient is φ = 28018264320.

The previous prime is 66650405641. The next prime is 66650405677.

66650405666 is nontrivially palindromic in base 10.

66650405666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2418440 + ... + 2445843.

It is an arithmetic number, because the mean of its divisors is an integer number (3677398704).

Almost surely, 2^66650405666 is an apocalyptic number.

66650405666 is a deficient number, since it is larger than the sum of its proper divisors (51026352862).

66650405666 is a wasteful number, since it uses less digits than its factorization.

66650405666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4864346.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 66650405666 in words is "sixty-six billion, six hundred fifty million, four hundred five thousand, six hundred sixty-six".