22215665724 has 96 divisors (see below), whose sum is σ = 60254025216. Its totient is φ = 6239462400.

The previous prime is 22215665699. The next prime is 22215665737. The reversal of 22215665724 is 42756651222.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1876624 + ... + 1888424.

It is an arithmetic number, because the mean of its divisors is an integer number (627646096).

Almost surely, 2^22215665724 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 22215665724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30127012608).

22215665724 is an abundant number, since it is smaller than the sum of its proper divisors (38038359492).

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

22215665724 is a wasteful number, since it uses less digits than its factorization.

22215665724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12195 (or 12193 counting only the distinct ones).

The product of its digits is 403200, while the sum is 42.

The spelling of 22215665724 in words is "twenty-two billion, two hundred fifteen million, six hundred sixty-five thousand, seven hundred twenty-four".