683221814557 has 2 divisors, whose sum is σ = 683221814558. Its totient is φ = 683221814556.

The previous prime is 683221814543. The next prime is 683221814579. The reversal of 683221814557 is 755418122386.

683221814557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421426882276 + 261794932281 = 649174^2 + 511659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-683221814557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (683221814537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341610907278 + 341610907279.

It is an arithmetic number, because the mean of its divisors is an integer number (341610907279).

Almost surely, 2^683221814557 is an apocalyptic number.

It is an amenable number.

683221814557 is a deficient number, since it is larger than the sum of its proper divisors (1).

683221814557 is an equidigital number, since it uses as much as digits as its factorization.

683221814557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 52.

The spelling of 683221814557 in words is "six hundred eighty-three billion, two hundred twenty-one million, eight hundred fourteen thousand, five hundred fifty-seven".