660599968 has 72 divisors (see below), whose sum is σ = 1517570964. Its totient is φ = 282240000.

The previous prime is 660599939. The next prime is 660600011. The reversal of 660599968 is 869995066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 565107984 + 95491984 = 23772^2 + 9772^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 942018 + ... + 942718.

Almost surely, 2^660599968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660599968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758785482).

660599968 is an abundant number, since it is smaller than the sum of its proper divisors (856970996).

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

660599968 is a wasteful number, since it uses less digits than its factorization.

660599968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 58.

The square root of 660599968 is about 25702.1393662084. The cubic root of 660599968 is about 870.9225111353.

The spelling of 660599968 in words is "six hundred sixty million, five hundred ninety-nine thousand, nine hundred sixty-eight".