11635686538 has 32 divisors (see below), whose sum is σ = 20159964288. Its totient is φ = 4933579200.

The previous prime is 11635686511. The next prime is 11635686551. The reversal of 11635686538 is 83568653611.

11635686538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1225128 + ... + 1234588.

It is an arithmetic number, because the mean of its divisors is an integer number (629998884).

Almost surely, 2^11635686538 is an apocalyptic number.

11635686538 is a deficient number, since it is larger than the sum of its proper divisors (8524277750).

11635686538 is a wasteful number, since it uses less digits than its factorization.

11635686538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10398.

The product of its digits is 3110400, while the sum is 52.

The spelling of 11635686538 in words is "eleven billion, six hundred thirty-five million, six hundred eighty-six thousand, five hundred thirty-eight".