683561297921 has 16 divisors (see below), whose sum is σ = 725654920320. Its totient is φ = 641677989120.

The previous prime is 683561297917. The next prime is 683561297957. The reversal of 683561297921 is 129792165386.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 683561297921 - 2² = 683561297917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (683561297911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26040215 + ... + 26066451.

It is an arithmetic number, because the mean of its divisors is an integer number (45353432520).

Almost surely, 2^683561297921 is an apocalyptic number.

It is an amenable number.

683561297921 is a deficient number, since it is larger than the sum of its proper divisors (42093622399).

683561297921 is a wasteful number, since it uses less digits than its factorization.

683561297921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30184.

The product of its digits is 9797760, while the sum is 59.

The spelling of 683561297921 in words is "six hundred eighty-three billion, five hundred sixty-one million, two hundred ninety-seven thousand, nine hundred twenty-one".