660040868 has 6 divisors (see below), whose sum is σ = 1155071526. Its totient is φ = 330020432.

The previous prime is 660040831. The next prime is 660040873. The reversal of 660040868 is 868040066.

It can be written as a sum of positive squares in only one way, i.e., 478384384 + 181656484 = 21872^2 + 13478^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82505105 + ... + 82505112.

It is an arithmetic number, because the mean of its divisors is an integer number (192511921).

Almost surely, 2^660040868 is an apocalyptic number.

It is an amenable number.

660040868 is a deficient number, since it is larger than the sum of its proper divisors (495030658).

660040868 is a wasteful number, since it uses less digits than its factorization.

660040868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165010221 (or 165010219 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 660040868 is about 25691.2605373890. The cubic root of 660040868 is about 870.6767394952.

The spelling of 660040868 in words is "six hundred sixty million, forty thousand, eight hundred sixty-eight".