208265485693 has 4 divisors (see below), whose sum is σ = 210605547420. Its totient is φ = 205925423968.

The previous prime is 208265485679. The next prime is 208265485697. The reversal of 208265485693 is 396584562802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 396584562802 = 2 ⋅198292281401.

It can be written as a sum of positive squares in 2 ways, for example, as 121910610649 + 86354875044 = 349157^2 + 293862^2 .

It is a cyclic number.

It is not a de Polignac number, because 208265485693 - 2²⁹ = 207728614781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208265485697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170030730 + ... + 1170030907.

It is an arithmetic number, because the mean of its divisors is an integer number (52651386855).

Almost surely, 2^208265485693 is an apocalyptic number.

It is an amenable number.

208265485693 is a deficient number, since it is larger than the sum of its proper divisors (2340061727).

208265485693 is an equidigital number, since it uses as much as digits as its factorization.

208265485693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340061726.

The product of its (nonzero) digits is 24883200, while the sum is 58.

The spelling of 208265485693 in words is "two hundred eight billion, two hundred sixty-five million, four hundred eighty-five thousand, six hundred ninety-three".