11571996216 has 64 divisors (see below), whose sum is σ = 32077411200. Its totient is φ = 3449174400.

The previous prime is 11571996199. The next prime is 11571996217. The reversal of 11571996216 is 61269917511.

It is a super-2 number, since 2×11571996216² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11571996217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343186 + ... + 375393.

It is an arithmetic number, because the mean of its divisors is an integer number (501209550).

Almost surely, 2^11571996216 is an apocalyptic number.

It is an amenable number.

11571996216 is an abundant number, since it is smaller than the sum of its proper divisors (20505414984).

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

11571996216 is a wasteful number, since it uses less digits than its factorization.

11571996216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718660 (or 718656 counting only the distinct ones).

The product of its digits is 204120, while the sum is 48.

The spelling of 11571996216 in words is "eleven billion, five hundred seventy-one million, nine hundred ninety-six thousand, two hundred sixteen".