11971570836 has 24 divisors (see below), whose sum is σ = 28089724320. Its totient is φ = 3968229472.

The previous prime is 11971570811. The next prime is 11971570841. The reversal of 11971570836 is 63807517911.

11971570836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×11971570836³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2784531 + ... + 2788826.

It is an arithmetic number, because the mean of its divisors is an integer number (1170405180).

Almost surely, 2^11971570836 is an apocalyptic number.

It is an amenable number.

11971570836 is an abundant number, since it is smaller than the sum of its proper divisors (16118153484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11971570836 is a wasteful number, since it uses less digits than its factorization.

11971570836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5573543 (or 5573541 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 48.

The spelling of 11971570836 in words is "eleven billion, nine hundred seventy-one million, five hundred seventy thousand, eight hundred thirty-six".