203245042555 has 4 divisors (see below), whose sum is σ = 243894051072. Its totient is φ = 162596034040.

The previous prime is 203245042513. The next prime is 203245042577. The reversal of 203245042555 is 555240542302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555240542302 = 2 ⋅277620271151.

It is not a de Polignac number, because 203245042555 - 2²¹ = 203242945403 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 20324504251 + ... + 20324504260.

It is an arithmetic number, because the mean of its divisors is an integer number (60973512768).

Almost surely, 2^203245042555 is an apocalyptic number.

203245042555 is a deficient number, since it is larger than the sum of its proper divisors (40649008517).

203245042555 is an equidigital number, since it uses as much as digits as its factorization.

203245042555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40649008516.

The product of its (nonzero) digits is 240000, while the sum is 37.

Adding to 203245042555 its reverse (555240542302), we get a palindrome (758485584857).

The spelling of 203245042555 in words is "two hundred three billion, two hundred forty-five million, forty-two thousand, five hundred fifty-five".