666452135544 has 32 divisors (see below), whose sum is σ = 1794294211920. Its totient is φ = 205062195456.

The previous prime is 666452135519. The next prime is 666452135579. The reversal of 666452135544 is 445531254666.

666452135544 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 7 ways as a sum of consecutive naturals, for example, 1068031957 + ... + 1068032580.

Almost surely, 2^666452135544 is an apocalyptic number.

It is an amenable number.

666452135544 is an abundant number, since it is smaller than the sum of its proper divisors (1127842076376).

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

666452135544 is a wasteful number, since it uses less digits than its factorization.

666452135544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136064559 (or 2136064555 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 51.

The spelling of 666452135544 in words is "six hundred sixty-six billion, four hundred fifty-two million, one hundred thirty-five thousand, five hundred forty-four".