203641663543205 has 4 divisors (see below), whose sum is σ = 244369996251852. Its totient is φ = 162913330834560.

The previous prime is 203641663543141. The next prime is 203641663543261. The reversal of 203641663543205 is 502345366146302.

It is a happy number.

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 21881195374756 + 181760468168449 = 4677734^2 + 13481857^2 .

It is not a de Polignac number, because 203641663543205 - 2⁶ = 203641663543141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20364166354316 + ... + 20364166354325.

It is an arithmetic number, because the mean of its divisors is an integer number (61092499062963).

Almost surely, 2^{203641663543205} is an apocalyptic number.

It is an amenable number.

203641663543205 is a deficient number, since it is larger than the sum of its proper divisors (40728332708647).

203641663543205 is an equidigital number, since it uses as much as digits as its factorization.

203641663543205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40728332708646.

The product of its (nonzero) digits is 9331200, while the sum is 50.

The spelling of 203641663543205 in words is "two hundred three trillion, six hundred forty-one billion, six hundred sixty-three million, five hundred forty-three thousand, two hundred five".