666765744 has 40 divisors (see below), whose sum is σ = 1723453680. Its totient is φ = 222129408.

The previous prime is 666765733. The next prime is 666765761. The reversal of 666765744 is 447567666.

666765744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 125902 + ... + 131090.

It is an arithmetic number, because the mean of its divisors is an integer number (43086342).

Almost surely, 2^666765744 is an apocalyptic number.

It is an amenable number.

666765744 is an abundant number, since it is smaller than the sum of its proper divisors (1056687936).

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

666765744 is a wasteful number, since it uses less digits than its factorization.

666765744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7877 (or 7871 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 51.

The square root of 666765744 is about 25821.8075277468. The cubic root of 666765744 is about 873.6237386041.

The spelling of 666765744 in words is "six hundred sixty-six million, seven hundred sixty-five thousand, seven hundred forty-four".