660817668 has 48 divisors (see below), whose sum is σ = 1767578624. Its totient is φ = 188226720.

The previous prime is 660817643. The next prime is 660817687. The reversal of 660817668 is 866718066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15921 + ... + 39687.

Almost surely, 2^660817668 is an apocalyptic number.

It is an amenable number.

660817668 is an abundant number, since it is smaller than the sum of its proper divisors (1106760956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660817668 is a wasteful number, since it uses less digits than its factorization.

660817668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24112 (or 24110 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 660817668 is about 25706.3740733694. The cubic root of 660817668 is about 871.0181711496.

The spelling of 660817668 in words is "six hundred sixty million, eight hundred seventeen thousand, six hundred sixty-eight".