11503205513 has 8 divisors (see below), whose sum is σ = 11558505600. Its totient is φ = 11447965648.

The previous prime is 11503205507. The next prime is 11503205531. The reversal of 11503205513 is 31550230511.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11503205513 - 2²⁴ = 11486428297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11503405513) 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, 394370 + ... + 422532.

It is an arithmetic number, because the mean of its divisors is an integer number (1444813200).

Almost surely, 2^11503205513 is an apocalyptic number.

It is an amenable number.

11503205513 is a deficient number, since it is larger than the sum of its proper divisors (55300087).

11503205513 is a wasteful number, since it uses less digits than its factorization.

11503205513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30111.

The product of its (nonzero) digits is 2250, while the sum is 26.

The spelling of 11503205513 in words is "eleven billion, five hundred three million, two hundred five thousand, five hundred thirteen".