66816268 has 6 divisors (see below), whose sum is σ = 116928476. Its totient is φ = 33408132.

The previous prime is 66816259. The next prime is 66816271. The reversal of 66816268 is 86261866.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8352030 + ... + 8352037.

Almost surely, 2^66816268 is an apocalyptic number.

It is an amenable number.

66816268 is a deficient number, since it is larger than the sum of its proper divisors (50112208).

66816268 is a wasteful number, since it uses less digits than its factorization.

66816268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16704071 (or 16704069 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 66816268 is about 8174.1218488594. The cubic root of 66816268 is about 405.7832082916.

The spelling of 66816268 in words is "sixty-six million, eight hundred sixteen thousand, two hundred sixty-eight".