11506643513 has 4 divisors (see below), whose sum is σ = 11507121780. Its totient is φ = 11506165248.

The previous prime is 11506643503. The next prime is 11506643531. The reversal of 11506643513 is 31534660511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31534660511 = 379 ⋅83204909.

It can be written as a sum of positive squares in 2 ways, for example, as 2932439104 + 8574204409 = 54152^2 + 92597^2 .

It is a cyclic number.

It is not a de Polignac number, because 11506643513 - 2¹⁰ = 11506642489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11506643503) 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 3 ways as a sum of consecutive naturals, for example, 201020 + ... + 251837.

It is an arithmetic number, because the mean of its divisors is an integer number (2876780445).

Almost surely, 2^11506643513 is an apocalyptic number.

It is an amenable number.

11506643513 is a deficient number, since it is larger than the sum of its proper divisors (478267).

11506643513 is an equidigital number, since it uses as much as digits as its factorization.

11506643513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478266.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 11506643513 in words is "eleven billion, five hundred six million, six hundred forty-three thousand, five hundred thirteen".