11687513647 has 4 divisors (see below), whose sum is σ = 11692253656. Its totient is φ = 11682773640.

The previous prime is 11687513623. The next prime is 11687513659. The reversal of 11687513647 is 74631578611.

11687513647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74631578611 = 397 ⋅187988863.

It is a cyclic number.

It is not a de Polignac number, because 11687513647 - 2¹⁵ = 11687480879 is a prime.

It is a super-2 number, since 2×11687513647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11687513647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11687513347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2366304 + ... + 2371237.

It is an arithmetic number, because the mean of its divisors is an integer number (2923063414).

Almost surely, 2^11687513647 is an apocalyptic number.

11687513647 is a deficient number, since it is larger than the sum of its proper divisors (4740009).

11687513647 is an equidigital number, since it uses as much as digits as its factorization.

11687513647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4740008.

The product of its digits is 846720, while the sum is 49.

The spelling of 11687513647 in words is "eleven billion, six hundred eighty-seven million, five hundred thirteen thousand, six hundred forty-seven".