685247068351 has 2 divisors, whose sum is σ = 685247068352. Its totient is φ = 685247068350.

The previous prime is 685247068327. The next prime is 685247068361. The reversal of 685247068351 is 153860742586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685247068351 - 2¹⁷ = 685246937279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685247068292 and 685247068301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685247068321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342623534175 + 342623534176.

It is an arithmetic number, because the mean of its divisors is an integer number (342623534176).

Almost surely, 2^685247068351 is an apocalyptic number.

685247068351 is a deficient number, since it is larger than the sum of its proper divisors (1).

685247068351 is an equidigital number, since it uses as much as digits as its factorization.

685247068351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 685247068351 in words is "six hundred eighty-five billion, two hundred forty-seven million, sixty-eight thousand, three hundred fifty-one".