11533221644 has 24 divisors (see below), whose sum is σ = 23068744608. Its totient is φ = 4942316160.

The previous prime is 11533221631. The next prime is 11533221659. The reversal of 11533221644 is 44612233511.

It is a self number, because there is not a number n which added to its sum of digits gives 11533221644.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473672 + ... + 497424.

It is an arithmetic number, because the mean of its divisors is an integer number (961197692).

Almost surely, 2^11533221644 is an apocalyptic number.

11533221644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

11533221644 is an abundant number, since it is smaller than the sum of its proper divisors (11535522964).

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

11533221644 is a wasteful number, since it uses less digits than its factorization.

11533221644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41105 (or 41103 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The spelling of 11533221644 in words is "eleven billion, five hundred thirty-three million, two hundred twenty-one thousand, six hundred forty-four".