666667888 has 20 divisors (see below), whose sum is σ = 1298810968. Its totient is φ = 331490880.

The previous prime is 666667861. The next prime is 666667907. The reversal of 666667888 is 888766666.

It is a plaindrome in base 10.

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, 112206 + ... + 117997.

Almost surely, 2^666667888 is an apocalyptic number.

It is an amenable number.

666667888 is a deficient number, since it is larger than the sum of its proper divisors (632143080).

666667888 is a wasteful number, since it uses less digits than its factorization.

666667888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230392 (or 230386 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 61.

The square root of 666667888 is about 25819.9126257236. The cubic root of 666667888 is about 873.5809982024.

The spelling of 666667888 in words is "six hundred sixty-six million, six hundred sixty-seven thousand, eight hundred eighty-eight".