203512113505 has 16 divisors (see below), whose sum is σ = 245084361984. Its totient is φ = 162230675200.

The previous prime is 203512113479. The next prime is 203512113509. The reversal of 203512113505 is 505311215302.

It is not a de Polignac number, because 203512113505 - 2¹⁷ = 203511982433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203512113509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1845144 + ... + 1952326.

It is an arithmetic number, because the mean of its divisors is an integer number (15317772624).

Almost surely, 2^203512113505 is an apocalyptic number.

It is an amenable number.

203512113505 is a deficient number, since it is larger than the sum of its proper divisors (41572248479).

203512113505 is a wasteful number, since it uses less digits than its factorization.

203512113505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108536.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 203512113505 its reverse (505311215302), we get a palindrome (708823328807).

The spelling of 203512113505 in words is "two hundred three billion, five hundred twelve million, one hundred thirteen thousand, five hundred five".