666733666716 has 240 divisors, whose sum is σ = 2021850851328. Its totient is φ = 189898473600.

The previous prime is 666733666681. The next prime is 666733666741. The reversal of 666733666716 is 617666337666.

666733666716 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2892151 + ... + 3114161.

Almost surely, 2^666733666716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666733666716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010925425664).

666733666716 is an abundant number, since it is smaller than the sum of its proper divisors (1355117184612).

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

666733666716 is a wasteful number, since it uses less digits than its factorization.

666733666716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222094 (or 222083 counting only the distinct ones).

The product of its digits is 123451776, while the sum is 63.

The spelling of 666733666716 in words is "six hundred sixty-six billion, seven hundred thirty-three million, six hundred sixty-six thousand, seven hundred sixteen".