668783412529 has 8 divisors (see below), whose sum is σ = 708267951720. Its totient is φ = 629314910976.

The previous prime is 668783412511. The next prime is 668783412533. The reversal of 668783412529 is 925214387866.

It can be written as a sum of positive squares in 4 ways, for example, as 514695760929 + 154087651600 = 717423^2 + 392540^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668783412529 - 2¹¹ = 668783410481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668783412559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3923494 + ... + 4090399.

It is an arithmetic number, because the mean of its divisors is an integer number (88533493965).

Almost surely, 2^668783412529 is an apocalyptic number.

It is an amenable number.

668783412529 is a deficient number, since it is larger than the sum of its proper divisors (39484539191).

668783412529 is a wasteful number, since it uses less digits than its factorization.

668783412529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8018819.

The product of its digits is 34836480, while the sum is 61.

The spelling of 668783412529 in words is "six hundred sixty-eight billion, seven hundred eighty-three million, four hundred twelve thousand, five hundred twenty-nine".