666740740668 has 96 divisors (see below), whose sum is σ = 1618514042880. Its totient is φ = 213396664320.

The previous prime is 666740740657. The next prime is 666740740693. The reversal of 666740740668 is 866047047666.

666740740668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24613980 + ... + 24641052.

It is an arithmetic number, because the mean of its divisors is an integer number (16859521280).

Almost surely, 2^666740740668 is an apocalyptic number.

It is an amenable number.

666740740668 is an abundant number, since it is smaller than the sum of its proper divisors (951773302212).

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

666740740668 is a wasteful number, since it uses less digits than its factorization.

666740740668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27627 (or 27625 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 60.

The spelling of 666740740668 in words is "six hundred sixty-six billion, seven hundred forty million, seven hundred forty thousand, six hundred sixty-eight".