666666667444 has 24 divisors (see below), whose sum is σ = 1172793440000. Its totient is φ = 331583582880.

The previous prime is 666666667427. The next prime is 666666667477. The reversal of 666666667444 is 444766666666.

666666667444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 666666667444.

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, 3528949 + ... + 3713059.

Almost surely, 2^666666667444 is an apocalyptic number.

It is an amenable number.

666666667444 is a deficient number, since it is larger than the sum of its proper divisors (506126772556).

666666667444 is a wasteful number, since it uses less digits than its factorization.

666666667444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188863 (or 188861 counting only the distinct ones).

The product of its digits is 752467968, while the sum is 67.

The spelling of 666666667444 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-seven thousand, four hundred forty-four".