668028528443 has 4 divisors (see below), whose sum is σ = 672028699440. Its totient is φ = 664028357448.

The previous prime is 668028528403. The next prime is 668028528449. The reversal of 668028528443 is 344825820866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668028528443 - 2³⁶ = 599309051707 is a prime.

It is a super-2 number, since 2×668028528443² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668028528449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000085248 + ... + 2000085581.

It is an arithmetic number, because the mean of its divisors is an integer number (168007174860).

Almost surely, 2^668028528443 is an apocalyptic number.

668028528443 is a deficient number, since it is larger than the sum of its proper divisors (4000170997).

668028528443 is a wasteful number, since it uses less digits than its factorization.

668028528443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000170996.

The product of its (nonzero) digits is 17694720, while the sum is 56.

The spelling of 668028528443 in words is "six hundred sixty-eight billion, twenty-eight million, five hundred twenty-eight thousand, four hundred forty-three".