683757221657 has 2 divisors, whose sum is σ = 683757221658. Its totient is φ = 683757221656.

The previous prime is 683757221627. The next prime is 683757221681. The reversal of 683757221657 is 756122757386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655057134736 + 28700086921 = 809356^2 + 169411^2 .

It is a cyclic number.

It is not a de Polignac number, because 683757221657 - 2¹⁰ = 683757220633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 683757221596 and 683757221605.

It is not a weakly prime, because it can be changed into another prime (683757221617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341878610828 + 341878610829.

It is an arithmetic number, because the mean of its divisors is an integer number (341878610829).

Almost surely, 2^683757221657 is an apocalyptic number.

It is an amenable number.

683757221657 is a deficient number, since it is larger than the sum of its proper divisors (1).

683757221657 is an equidigital number, since it uses as much as digits as its factorization.

683757221657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29635200, while the sum is 59.

The spelling of 683757221657 in words is "six hundred eighty-three billion, seven hundred fifty-seven million, two hundred twenty-one thousand, six hundred fifty-seven".