66646464666 has 32 divisors (see below), whose sum is σ = 137945885760. Its totient is φ = 21440625024.

The previous prime is 66646464629. The next prime is 66646464679.

66646464666 is nontrivially palindromic in base 10.

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, 352861 + ... + 507743.

It is an arithmetic number, because the mean of its divisors is an integer number (4310808930).

Almost surely, 2^66646464666 is an apocalyptic number.

66646464666 is an abundant number, since it is smaller than the sum of its proper divisors (71299421094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66646464666 is a wasteful number, since it uses less digits than its factorization.

66646464666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157390.

The product of its digits is 107495424, while the sum is 60.

The spelling of 66646464666 in words is "sixty-six billion, six hundred forty-six million, four hundred sixty-four thousand, six hundred sixty-six".