22561397856 has 120 divisors (see below), whose sum is σ = 67604788944. Its totient is φ = 7378525440.

The previous prime is 22561397851. The next prime is 22561397869. The reversal of 22561397856 is 65879316522.

22561397856 is a `hidden beast` number, since 2 + 2 + 561 + 3 + 9 + 78 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22561397851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 55261 + ... + 219491.

Almost surely, 2^22561397856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22561397856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33802394472).

22561397856 is an abundant number, since it is smaller than the sum of its proper divisors (45043391088).

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

22561397856 is a wasteful number, since it uses less digits than its factorization.

22561397856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164306 (or 164289 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 22561397856 in words is "twenty-two billion, five hundred sixty-one million, three hundred ninety-seven thousand, eight hundred fifty-six".