20666266664 has 16 divisors (see below), whose sum is σ = 38757085620. Its totient is φ = 10331043840.

The previous prime is 20666266633. The next prime is 20666266669. The reversal of 20666266664 is 46666266602.

It can be written as a sum of positive squares in 2 ways, for example, as 18964044100 + 1702222564 = 137710^2 + 41258^2 .

It is not an unprimeable number, because it can be changed into a prime (20666266669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218747 + ... + 298634.

Almost surely, 2^20666266664 is an apocalyptic number.

It is an amenable number.

20666266664 is a deficient number, since it is larger than the sum of its proper divisors (18090818956).

20666266664 is a wasteful number, since it uses less digits than its factorization.

20666266664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522380 (or 522376 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 50.

The spelling of 20666266664 in words is "twenty billion, six hundred sixty-six million, two hundred sixty-six thousand, six hundred sixty-four".