666728512224 has 48 divisors (see below), whose sum is σ = 1751238453888. Its totient is φ = 222106188672.

The previous prime is 666728512211. The next prime is 666728512231. The reversal of 666728512224 is 422215827666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1978132 + ... + 2290515.

It is an arithmetic number, because the mean of its divisors is an integer number (36484134456).

Almost surely, 2^666728512224 is an apocalyptic number.

It is an amenable number.

666728512224 is an abundant number, since it is smaller than the sum of its proper divisors (1084509941664).

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

666728512224 is a wasteful number, since it uses less digits than its factorization.

666728512224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270287 (or 4270279 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 51.

The spelling of 666728512224 in words is "six hundred sixty-six billion, seven hundred twenty-eight million, five hundred twelve thousand, two hundred twenty-four".