666843228748 has 6 divisors (see below), whose sum is σ = 1166975650316. Its totient is φ = 333421614372.

The previous prime is 666843228707. The next prime is 666843228781. The reversal of 666843228748 is 847822348666.

It is a self number, because there is not a number n which added to its sum of digits gives 666843228748.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83355403590 + ... + 83355403597.

Almost surely, 2^666843228748 is an apocalyptic number.

It is an amenable number.

666843228748 is a deficient number, since it is larger than the sum of its proper divisors (500132421568).

666843228748 is a wasteful number, since it uses less digits than its factorization.

666843228748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166710807191 (or 166710807189 counting only the distinct ones).

The product of its digits is 148635648, while the sum is 64.

The spelling of 666843228748 in words is "six hundred sixty-six billion, eight hundred forty-three million, two hundred twenty-eight thousand, seven hundred forty-eight".