203065816813 has 4 divisors (see below), whose sum is σ = 205159278940. Its totient is φ = 200972354688.

The previous prime is 203065816781. The next prime is 203065816831. The reversal of 203065816813 is 318618560302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43799374089 + 159266442724 = 209283^2 + 399082^2 .

It is a cyclic number.

It is not a de Polignac number, because 203065816813 - 2⁵ = 203065816781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203065816813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203065816853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046730918 + ... + 1046731111.

It is an arithmetic number, because the mean of its divisors is an integer number (51289819735).

Almost surely, 2^203065816813 is an apocalyptic number.

It is an amenable number.

203065816813 is a deficient number, since it is larger than the sum of its proper divisors (2093462127).

203065816813 is an equidigital number, since it uses as much as digits as its factorization.

203065816813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093462126.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 203065816813 in words is "two hundred three billion, sixty-five million, eight hundred sixteen thousand, eight hundred thirteen".