203453113512 has 128 divisors (see below), whose sum is σ = 579275919360. Its totient is φ = 58943512320.

The previous prime is 203453113499. The next prime is 203453113517. The reversal of 203453113512 is 215311354302.

It is a self number, because there is not a number n which added to its sum of digits gives 203453113512.

It is not an unprimeable number, because it can be changed into a prime (203453113517) 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 31 ways as a sum of consecutive naturals, for example, 14851338 + ... + 14865030.

It is an arithmetic number, because the mean of its divisors is an integer number (4525593120).

Almost surely, 2^203453113512 is an apocalyptic number.

203453113512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203453113512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289637959680).

203453113512 is an abundant number, since it is smaller than the sum of its proper divisors (375822805848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

203453113512 is a wasteful number, since it uses less digits than its factorization.

203453113512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16183 (or 16179 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 203453113512 its reverse (215311354302), we get a palindrome (418764467814).

The spelling of 203453113512 in words is "two hundred three billion, four hundred fifty-three million, one hundred thirteen thousand, five hundred twelve".