22561206660 has 144 divisors (see below), whose sum is σ = 70770266112. Its totient is φ = 5811782400.

The previous prime is 22561206659. The next prime is 22561206673. The reversal of 22561206660 is 6660216522.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 3383730 + ... + 3390390.

Almost surely, 2^22561206660 is an apocalyptic number.

22561206660 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 22561206660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35385133056).

22561206660 is an abundant number, since it is smaller than the sum of its proper divisors (48209059452).

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

22561206660 is a wasteful number, since it uses less digits than its factorization.

22561206660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314 (or 7309 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 22561206660 in words is "twenty-two billion, five hundred sixty-one million, two hundred six thousand, six hundred sixty".