22565521000 has 256 divisors, whose sum is σ = 61293024000. Its totient is φ = 7689600000.

The previous prime is 22565520983. The next prime is 22565521003. The reversal of 22565521000 is 12556522.

It is a self number, because there is not a number n which added to its sum of digits gives 22565521000.

It is not an unprimeable number, because it can be changed into a prime (22565521003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21108466 + ... + 21109534.

It is an arithmetic number, because the mean of its divisors is an integer number (239425875).

Almost surely, 2^22565521000 is an apocalyptic number.

22565521000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22565521000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30646512000).

22565521000 is an abundant number, since it is smaller than the sum of its proper divisors (38727503000).

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

22565521000 is a wasteful number, since it uses less digits than its factorization.

22565521000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1207 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 22565521000 in words is "twenty-two billion, five hundred sixty-five million, five hundred twenty-one thousand".