685629773 has 2 divisors, whose sum is σ = 685629774. Its totient is φ = 685629772.

The previous prime is 685629733. The next prime is 685629781. The reversal of 685629773 is 377926586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650607049 + 35022724 = 25507^2 + 5918^2 .

It is a cyclic number.

It is not a de Polignac number, because 685629773 - 2²⁰ = 684581197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685629733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342814886 + 342814887.

It is an arithmetic number, because the mean of its divisors is an integer number (342814887).

Almost surely, 2^685629773 is an apocalyptic number.

It is an amenable number.

685629773 is a deficient number, since it is larger than the sum of its proper divisors (1).

685629773 is an equidigital number, since it uses as much as digits as its factorization.

685629773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 53.

The square root of 685629773 is about 26184.5330873017. The cubic root of 685629773 is about 881.7860476034.

The spelling of 685629773 in words is "six hundred eighty-five million, six hundred twenty-nine thousand, seven hundred seventy-three".