660688896 has 104 divisors (see below), whose sum is σ = 2013544384. Its totient is φ = 188743680.

The previous prime is 660688891. The next prime is 660688913. The reversal of 660688896 is 698886066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660688891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82176 + ... + 89856.

Almost surely, 2^660688896 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 660688896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006772192).

660688896 is an abundant number, since it is smaller than the sum of its proper divisors (1352855488).

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

660688896 is an equidigital number, since it uses as much as digits as its factorization.

660688896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715 (or 7693 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 57.

The square root of 660688896 is about 25703.8692807134. The cubic root of 660688896 is about 870.9615897133.

The spelling of 660688896 in words is "six hundred sixty million, six hundred eighty-eight thousand, eight hundred ninety-six".