22721609664 has 84 divisors (see below), whose sum is σ = 70137214056. Its totient is φ = 6991262208.

The previous prime is 22721609663. The next prime is 22721609761. The reversal of 22721609664 is 46690612722.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22721609663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1509714 + ... + 1524689.

It is an arithmetic number, because the mean of its divisors is an integer number (834966834).

Almost surely, 2^22721609664 is an apocalyptic number.

22721609664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22721609664 is an abundant number, since it is smaller than the sum of its proper divisors (47415604392).

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

22721609664 is a wasteful number, since it uses less digits than its factorization.

22721609664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034434 (or 3034421 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 22721609664 in words is "twenty-two billion, seven hundred twenty-one million, six hundred nine thousand, six hundred sixty-four".