22312306656 has 144 divisors (see below), whose sum is σ = 66135888000. Its totient is φ = 7399548288.

The previous prime is 22312306603. The next prime is 22312306661. The reversal of 22312306656 is 65660321322.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-3 number, since 3×22312306656³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a self number, because there is not a number n which added to its sum of digits gives 22312306656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1540215 + ... + 1554633.

It is an arithmetic number, because the mean of its divisors is an integer number (459277000).

Almost surely, 2^22312306656 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 22312306656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33067944000).

22312306656 is an abundant number, since it is smaller than the sum of its proper divisors (43823581344).

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

22312306656 is a wasteful number, since it uses less digits than its factorization.

22312306656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14643 (or 14623 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 22312306656 its reverse (65660321322), we get a palindrome (87972627978).

The spelling of 22312306656 in words is "twenty-two billion, three hundred twelve million, three hundred six thousand, six hundred fifty-six".