667043668 has 6 divisors (see below), whose sum is σ = 1167326426. Its totient is φ = 333521832.

The previous prime is 667043639. The next prime is 667043681. The reversal of 667043668 is 866340766.

It can be written as a sum of positive squares in only one way, i.e., 659359684 + 7683984 = 25678^2 + 2772^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83380455 + ... + 83380462.

Almost surely, 2^667043668 is an apocalyptic number.

It is an amenable number.

667043668 is a deficient number, since it is larger than the sum of its proper divisors (500282758).

667043668 is a wasteful number, since it uses less digits than its factorization.

667043668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166760921 (or 166760919 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 46.

The square root of 667043668 is about 25827.1885423094. The cubic root of 667043668 is about 873.7451042055.

The spelling of 667043668 in words is "six hundred sixty-seven million, forty-three thousand, six hundred sixty-eight".