203873504689 has 4 divisors (see below), whose sum is σ = 204164337780. Its totient is φ = 203582671600.

The previous prime is 203873504687. The next prime is 203873504713. The reversal of 203873504689 is 986405378302.

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 88219098289 + 115654406400 = 297017^2 + 340080^2 .

It is a cyclic number.

It is not a de Polignac number, because 203873504689 - 2¹ = 203873504687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203873504687) 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, 145415494 + ... + 145416895.

It is an arithmetic number, because the mean of its divisors is an integer number (51041084445).

Almost surely, 2^203873504689 is an apocalyptic number.

It is an amenable number.

203873504689 is a deficient number, since it is larger than the sum of its proper divisors (290833091).

203873504689 is an equidigital number, since it uses as much as digits as its factorization.

203873504689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290833090.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 203873504689 in words is "two hundred three billion, eight hundred seventy-three million, five hundred four thousand, six hundred eighty-nine".