685800281486321 has 2 divisors, whose sum is σ = 685800281486322. Its totient is φ = 685800281486320.

The previous prime is 685800281486231. The next prime is 685800281486329. The reversal of 685800281486321 is 123684182008586.

Together with previous prime (685800281486231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661417375697296 + 24382905789025 = 25718036^2 + 4937905^2 .

It is a cyclic number.

It is not a de Polignac number, because 685800281486321 - 2²² = 685800277292017 is a prime.

It is a super-3 number, since 3×685800281486321³ (a number of 45 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (685800281486329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342900140743160 + 342900140743161.

It is an arithmetic number, because the mean of its divisors is an integer number (342900140743161).

Almost surely, 2^{685800281486321} is an apocalyptic number.

It is an amenable number.

685800281486321 is a deficient number, since it is larger than the sum of its proper divisors (1).

685800281486321 is an equidigital number, since it uses as much as digits as its factorization.

685800281486321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35389440, while the sum is 62.

The spelling of 685800281486321 in words is "six hundred eighty-five trillion, eight hundred billion, two hundred eighty-one million, four hundred eighty-six thousand, three hundred twenty-one".