660613968 has 360 divisors, whose sum is σ = 2342945280. Its totient is φ = 176359680.

The previous prime is 660613963. The next prime is 660613969. The reversal of 660613968 is 869316066.

660613968 is a `hidden beast` number, since 6 + 606 + 1 + 39 + 6 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660613963) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 21310113 + ... + 21310143.

Almost surely, 2^660613968 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 660613968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171472640).

660613968 is an abundant number, since it is smaller than the sum of its proper divisors (1682331312).

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

660613968 is an equidigital number, since it uses as much as digits as its factorization.

660613968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 660613968 is about 25702.4117156348. The cubic root of 660613968 is about 870.9286635370.

The spelling of 660613968 in words is "six hundred sixty million, six hundred thirteen thousand, nine hundred sixty-eight".