66685058666 has 4 divisors (see below), whose sum is σ = 100027588002. Its totient is φ = 33342529332.

The previous prime is 66685058599. The next prime is 66685058731.

66685058666 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34597860025 + 32087198641 = 186005^2 + 179129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66685058599 and 66685058608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16671264665 + ... + 16671264668.

Almost surely, 2^66685058666 is an apocalyptic number.

66685058666 is a deficient number, since it is larger than the sum of its proper divisors (33342529336).

66685058666 is a wasteful number, since it uses less digits than its factorization.

66685058666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33342529335.

The product of its (nonzero) digits is 74649600, while the sum is 62.

The spelling of 66685058666 in words is "sixty-six billion, six hundred eighty-five million, fifty-eight thousand, six hundred sixty-six".