668038440329 has 8 divisors (see below), whose sum is σ = 719451674760. Its totient is φ = 616628871936.

The previous prime is 668038440217. The next prime is 668038440337. The reversal of 668038440329 is 923044830866.

It can be written as a sum of positive squares in 4 ways, for example, as 31357326400 + 636681113929 = 177080^2 + 797923^2 .

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 668038440329 - 2¹⁶ = 668038374793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668038440359) 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, 532064 + ... + 1272465.

It is an arithmetic number, because the mean of its divisors is an integer number (89931459345).

Almost surely, 2^668038440329 is an apocalyptic number.

It is an amenable number.

668038440329 is a deficient number, since it is larger than the sum of its proper divisors (51413234431).

668038440329 is a wasteful number, since it uses less digits than its factorization.

668038440329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833019.

The product of its (nonzero) digits is 5971968, while the sum is 53.

The spelling of 668038440329 in words is "six hundred sixty-eight billion, thirty-eight million, four hundred forty thousand, three hundred twenty-nine".