685526773 has 2 divisors, whose sum is σ = 685526774. Its totient is φ = 685526772.

The previous prime is 685526747. The next prime is 685526789. The reversal of 685526773 is 377625586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 683195044 + 2331729 = 26138^2 + 1527^2 .

It is a cyclic number.

It is not a de Polignac number, because 685526773 - 2⁵ = 685526741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685526473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342763386 + 342763387.

It is an arithmetic number, because the mean of its divisors is an integer number (342763387).

Almost surely, 2^685526773 is an apocalyptic number.

It is an amenable number.

685526773 is a deficient number, since it is larger than the sum of its proper divisors (1).

685526773 is an equidigital number, since it uses as much as digits as its factorization.

685526773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 49.

The square root of 685526773 is about 26182.5662034874. The cubic root of 685526773 is about 881.7418894124.

The spelling of 685526773 in words is "six hundred eighty-five million, five hundred twenty-six thousand, seven hundred seventy-three".