201511123503 has 32 divisors (see below), whose sum is σ = 275928768000. Its totient is φ = 130766608896.

The previous prime is 201511123493. The next prime is 201511123523. The reversal of 201511123503 is 305321115102.

It is not a de Polignac number, because 201511123503 - 2⁴ = 201511123487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201511123523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43342723 + ... + 43347371.

It is an arithmetic number, because the mean of its divisors is an integer number (8622774000).

Almost surely, 2^201511123503 is an apocalyptic number.

201511123503 is a deficient number, since it is larger than the sum of its proper divisors (74417644497).

201511123503 is a wasteful number, since it uses less digits than its factorization.

201511123503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7231.

The product of its (nonzero) digits is 900, while the sum is 24.

Adding to 201511123503 its reverse (305321115102), we get a palindrome (506832238605).

The spelling of 201511123503 in words is "two hundred one billion, five hundred eleven million, one hundred twenty-three thousand, five hundred three".