666924722888 has 12 divisors (see below), whose sum is σ = 1250488186395. Its totient is φ = 333461206520.

The previous prime is 666924722881. The next prime is 666924722897. The reversal of 666924722888 is 888227429666.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 333462361444 + 333462361444 = 577462^2 + 577462^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=577462.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666924722881) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2165483 + ... + 2454213.

Almost surely, 2^666924722888 is an apocalyptic number.

It is an amenable number.

666924722888 is a deficient number, since it is larger than the sum of its proper divisors (583563463507).

666924722888 is an frugal number, since it uses more digits than its factorization.

666924722888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577468 (or 288733 counting only the distinct ones).

The product of its digits is 222953472, while the sum is 68.

The spelling of 666924722888 in words is "six hundred sixty-six billion, nine hundred twenty-four million, seven hundred twenty-two thousand, eight hundred eighty-eight".