660549996 has 18 divisors (see below), whose sum is σ = 1669723692. Its totient is φ = 220183320.

The previous prime is 660549947. The next prime is 660549997. The reversal of 660549996 is 699945066.

It is a happy number.

660549996 is a `hidden beast` number, since 6 + 6 + 0 + 549 + 9 + 96 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (660549997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9174270 + ... + 9174341.

Almost surely, 2^660549996 is an apocalyptic number.

It is an amenable number.

660549996 is an abundant number, since it is smaller than the sum of its proper divisors (1009173696).

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

660549996 is a wasteful number, since it uses less digits than its factorization.

660549996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18348621 (or 18348616 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The square root of 660549996 is about 25701.1672108486. The cubic root of 660549996 is about 870.9005498681.

The spelling of 660549996 in words is "six hundred sixty million, five hundred forty-nine thousand, nine hundred ninety-six".