11503260423 has 6 divisors (see below), whose sum is σ = 16615820624. Its totient is φ = 7668840276.

The previous prime is 11503260403. The next prime is 11503260451. The reversal of 11503260423 is 32406230511.

11503260423 is a `hidden beast` number, since 1 + 1 + 5 + 0 + 32 + 604 + 23 = 666.

It is not a de Polignac number, because 11503260423 - 2¹⁸ = 11502998279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503260403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 639070015 + ... + 639070032.

Almost surely, 2^11503260423 is an apocalyptic number.

11503260423 is a deficient number, since it is larger than the sum of its proper divisors (5112560201).

11503260423 is a wasteful number, since it uses less digits than its factorization.

11503260423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278140053 (or 1278140050 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 11503260423 its reverse (32406230511), we get a palindrome (43909490934).

The spelling of 11503260423 in words is "eleven billion, five hundred three million, two hundred sixty thousand, four hundred twenty-three".