203243212555 has 8 divisors (see below), whose sum is σ = 245753625744. Its totient is φ = 161353389600.

The previous prime is 203243212541. The next prime is 203243212559. The reversal of 203243212555 is 555212342302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 203243212555 - 2³³ = 194653277963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203243212555.

It is not an unprimeable number, because it can be changed into a prime (203243212559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155146836 + ... + 155148145.

It is an arithmetic number, because the mean of its divisors is an integer number (30719203218).

Almost surely, 2^203243212555 is an apocalyptic number.

203243212555 is a deficient number, since it is larger than the sum of its proper divisors (42510413189).

203243212555 is a wasteful number, since it uses less digits than its factorization.

203243212555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310295117.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 203243212555 its reverse (555212342302), we get a palindrome (758455554857).

The spelling of 203243212555 in words is "two hundred three billion, two hundred forty-three million, two hundred twelve thousand, five hundred fifty-five".