203115320155 has 16 divisors (see below), whose sum is σ = 270403142400. Its totient is φ = 145216497760.

The previous prime is 203115320113. The next prime is 203115320197. The reversal of 203115320155 is 551023511302.

It is an interprime number because it is at equal distance from previous prime (203115320113) and next prime (203115320197).

It is a de Polignac number, because none of the positive numbers 2^k-203115320155 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 31293415 + ... + 31299904.

It is an arithmetic number, because the mean of its divisors is an integer number (16900196400).

Almost surely, 2^203115320155 is an apocalyptic number.

203115320155 is a deficient number, since it is larger than the sum of its proper divisors (67287822245).

203115320155 is a wasteful number, since it uses less digits than its factorization.

203115320155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62593394.

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

Adding to 203115320155 its reverse (551023511302), we get a palindrome (754138831457).

The spelling of 203115320155 in words is "two hundred three billion, one hundred fifteen million, three hundred twenty thousand, one hundred fifty-five".