666443666140 has 48 divisors (see below), whose sum is σ = 1615301118144. Its totient is φ = 226232640000.

The previous prime is 666443666107. The next prime is 666443666153. The reversal of 666443666140 is 41666344666.

666443666140 is digitally balanced in base 2, because in such base 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 15 ways as a sum of consecutive naturals, for example, 23551761 + ... + 23580040.

It is an arithmetic number, because the mean of its divisors is an integer number (33652106628).

Almost surely, 2^666443666140 is an apocalyptic number.

It is an amenable number.

666443666140 is an abundant number, since it is smaller than the sum of its proper divisors (948857452004).

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

666443666140 is a wasteful number, since it uses less digits than its factorization.

666443666140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47131918 (or 47131916 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 52.

The spelling of 666443666140 in words is "six hundred sixty-six billion, four hundred forty-three million, six hundred sixty-six thousand, one hundred forty".