11503544013 has 12 divisors (see below), whose sum is σ = 17894401980. Its totient is φ = 7079103936.

The previous prime is 11503543943. The next prime is 11503544033. The reversal of 11503544013 is 31044530511.

It is a happy number.

11503544013 is a `hidden beast` number, since 115 + 0 + 3 + 544 + 0 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7211066724 + 4292477289 = 84918^2 + 65517^2 .

It is not a de Polignac number, because 11503544013 - 2⁹ = 11503543501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503544033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49160328 + ... + 49160561.

It is an arithmetic number, because the mean of its divisors is an integer number (1491200165).

Almost surely, 2^11503544013 is an apocalyptic number.

11503544013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11503544013 is a deficient number, since it is larger than the sum of its proper divisors (6390857967).

11503544013 is a wasteful number, since it uses less digits than its factorization.

11503544013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98320908 (or 98320905 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 11503544013 in words is "eleven billion, five hundred three million, five hundred forty-four thousand, thirteen".