668524721382 has 160 divisors (see below), whose sum is σ = 1815713501184. Its totient is φ = 179706859200.

The previous prime is 668524721377. The next prime is 668524721393. The reversal of 668524721382 is 283127425866.

668524721382 is a `hidden beast` number, since 6 + 6 + 85 + 2 + 472 + 13 + 82 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1380907 + ... + 1801097.

Almost surely, 2^668524721382 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668524721382, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907856750592).

668524721382 is an abundant number, since it is smaller than the sum of its proper divisors (1147188779802).

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

668524721382 is a wasteful number, since it uses less digits than its factorization.

668524721382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420296 (or 420287 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 668524721382 in words is "six hundred sixty-eight billion, five hundred twenty-four million, seven hundred twenty-one thousand, three hundred eighty-two".