203645144243 has 4 divisors (see below), whose sum is σ = 203672243040. Its totient is φ = 203618045448.

The previous prime is 203645144191. The next prime is 203645144249. The reversal of 203645144243 is 342441546302.

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

It is a cyclic number.

It is not a de Polignac number, because 203645144243 - 2²⁴ = 203628367027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203645144197 and 203645144206.

It is not an unprimeable number, because it can be changed into a prime (203645144249) 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, 13538123 + ... + 13553156.

It is an arithmetic number, because the mean of its divisors is an integer number (50918060760).

Almost surely, 2^203645144243 is an apocalyptic number.

203645144243 is a deficient number, since it is larger than the sum of its proper divisors (27098797).

203645144243 is an equidigital number, since it uses as much as digits as its factorization.

203645144243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27098796.

The product of its (nonzero) digits is 276480, while the sum is 38.

The spelling of 203645144243 in words is "two hundred three billion, six hundred forty-five million, one hundred forty-four thousand, two hundred forty-three".