685780253 has 2 divisors, whose sum is σ = 685780254. Its totient is φ = 685780252.

The previous prime is 685780247. The next prime is 685780301. The reversal of 685780253 is 352087586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475327204 + 210453049 = 21802^2 + 14507^2 .

It is a cyclic number.

It is not a de Polignac number, because 685780253 - 2⁶ = 685780189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685780453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342890126 + 342890127.

It is an arithmetic number, because the mean of its divisors is an integer number (342890127).

Almost surely, 2^685780253 is an apocalyptic number.

It is an amenable number.

685780253 is a deficient number, since it is larger than the sum of its proper divisors (1).

685780253 is an equidigital number, since it uses as much as digits as its factorization.

685780253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 685780253 is about 26187.4063816942. The cubic root of 685780253 is about 881.8505534846.

The spelling of 685780253 in words is "six hundred eighty-five million, seven hundred eighty thousand, two hundred fifty-three".