666452135540 has 12 divisors (see below), whose sum is σ = 1399549484676. Its totient is φ = 266580854208.

The previous prime is 666452135519. The next prime is 666452135579. The reversal of 666452135540 is 45531254666.

666452135540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 326390545636 + 340061589904 = 571306^2 + 583148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16661303369 + ... + 16661303408.

It is an arithmetic number, because the mean of its divisors is an integer number (116629123723).

Almost surely, 2^666452135540 is an apocalyptic number.

It is an amenable number.

666452135540 is an abundant number, since it is smaller than the sum of its proper divisors (733097349136).

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

666452135540 is a wasteful number, since it uses less digits than its factorization.

666452135540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33322606786 (or 33322606784 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 666452135540 in words is "six hundred sixty-six billion, four hundred fifty-two million, one hundred thirty-five thousand, five hundred forty".