666066436992 has 768 divisors, whose sum is σ = 2306771550720. Its totient is φ = 189301432320.

The previous prime is 666066436979. The next prime is 666066437081. The reversal of 666066436992 is 299634660666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 417072738 + ... + 417074334.

It is an arithmetic number, because the mean of its divisors is an integer number (3003608790).

Almost surely, 2^666066436992 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 666066436992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153385775360).

666066436992 is an abundant number, since it is smaller than the sum of its proper divisors (1640705113728).

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

666066436992 is a wasteful number, since it uses less digits than its factorization.

666066436992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 63.

The spelling of 666066436992 in words is "six hundred sixty-six billion, sixty-six million, four hundred thirty-six thousand, nine hundred ninety-two".