11511545503 has 8 divisors (see below), whose sum is σ = 11552699072. Its totient is φ = 11470445856.

The previous prime is 11511545449. The next prime is 11511545533. The reversal of 11511545503 is 30554511511.

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 11511545503 - 2²⁵ = 11477991071 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 (11511545533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441301 + ... + 466657.

It is an arithmetic number, because the mean of its divisors is an integer number (1444087384).

Almost surely, 2^11511545503 is an apocalyptic number.

11511545503 is a deficient number, since it is larger than the sum of its proper divisors (41153569).

11511545503 is a wasteful number, since it uses less digits than its factorization.

11511545503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26961.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 11511545503 in words is "eleven billion, five hundred eleven million, five hundred forty-five thousand, five hundred three".