683942644991 has 4 divisors (see below), whose sum is σ = 690993600192. Its totient is φ = 676891689792.

The previous prime is 683942644967. The next prime is 683942644999. The reversal of 683942644991 is 199446249386.

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 683942644991 - 2¹⁸ = 683942382847 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 (683942644999) 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, 3525477455 + ... + 3525477648.

It is an arithmetic number, because the mean of its divisors is an integer number (172748400048).

Almost surely, 2^683942644991 is an apocalyptic number.

683942644991 is a deficient number, since it is larger than the sum of its proper divisors (7050955201).

683942644991 is an equidigital number, since it uses as much as digits as its factorization.

683942644991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050955200.

The product of its digits is 80621568, while the sum is 65.

The spelling of 683942644991 in words is "six hundred eighty-three billion, nine hundred forty-two million, six hundred forty-four thousand, nine hundred ninety-one".