660782634624 has 640 divisors, whose sum is σ = 2306346577920. Its totient is φ = 183884359680.

The previous prime is 660782634607. The next prime is 660782634647. The reversal of 660782634624 is 426436287066.

660782634624 is a `hidden beast` number, since 6 + 6 + 0 + 7 + 8 + 2 + 6 + 3 + 4 + 624 = 666.

660782634624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1047198789 + ... + 1047199419.

It is an arithmetic number, because the mean of its divisors is an integer number (3603666528).

Almost surely, 2^660782634624 is an apocalyptic number.

660782634624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660782634624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153173288960).

660782634624 is an abundant number, since it is smaller than the sum of its proper divisors (1645563943296).

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

660782634624 is a wasteful number, since it uses less digits than its factorization.

660782634624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 54.

The spelling of 660782634624 in words is "six hundred sixty billion, seven hundred eighty-two million, six hundred thirty-four thousand, six hundred twenty-four".