22220400660 has 24 divisors (see below), whose sum is σ = 62217122016. Its totient is φ = 5925440160.

The previous prime is 22220400641. The next prime is 22220400673. The reversal of 22220400660 is 6600402222.

It is a self number, because there is not a number n which added to its sum of digits gives 22220400660.

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 7 ways as a sum of consecutive naturals, for example, 185169946 + ... + 185170065.

It is an arithmetic number, because the mean of its divisors is an integer number (2592380084).

Almost surely, 2^22220400660 is an apocalyptic number.

22220400660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22220400660 is an abundant number, since it is smaller than the sum of its proper divisors (39996721356).

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

22220400660 is a wasteful number, since it uses less digits than its factorization.

22220400660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370340023 (or 370340021 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 22220400660 its reverse (6600402222), we get a palindrome (28820802882).

The spelling of 22220400660 in words is "twenty-two billion, two hundred twenty million, four hundred thousand, six hundred sixty".