668712543 has 16 divisors (see below), whose sum is σ = 939381120. Its totient is φ = 421968096.

The previous prime is 668712533. The next prime is 668712571. The reversal of 668712543 is 345217866.

It is not a de Polignac number, because 668712543 - 2¹⁷ = 668581471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668712495 and 668712504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668712523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68196 + ... + 77382.

It is an arithmetic number, because the mean of its divisors is an integer number (58711320).

Almost surely, 2^668712543 is an apocalyptic number.

668712543 is a deficient number, since it is larger than the sum of its proper divisors (270668577).

668712543 is a wasteful number, since it uses less digits than its factorization.

668712543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486.

The product of its digits is 241920, while the sum is 42.

The square root of 668712543 is about 25859.4768508568. The cubic root of 668712543 is about 874.4731709738.

The spelling of 668712543 in words is "six hundred sixty-eight million, seven hundred twelve thousand, five hundred forty-three".