6668840533 has 4 divisors (see below), whose sum is σ = 7019832160. Its totient is φ = 6317848908.

The previous prime is 6668840513. The next prime is 6668840567. The reversal of 6668840533 is 3350488666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6668840533 - 2¹⁷ = 6668709461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668840513) 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, 175495785 + ... + 175495822.

It is an arithmetic number, because the mean of its divisors is an integer number (1754958040).

Almost surely, 2^6668840533 is an apocalyptic number.

It is an amenable number.

6668840533 is a deficient number, since it is larger than the sum of its proper divisors (350991627).

6668840533 is a wasteful number, since it uses less digits than its factorization.

6668840533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350991626.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The square root of 6668840533 is about 81662.9691659567. The cubic root of 6668840533 is about 1882.2766041850.

The spelling of 6668840533 in words is "six billion, six hundred sixty-eight million, eight hundred forty thousand, five hundred thirty-three".