4221556660 has 12 divisors (see below), whose sum is σ = 8865269028. Its totient is φ = 1688622656.

The previous prime is 4221556649. The next prime is 4221556673. The reversal of 4221556660 is 666551224.

It can be written as a sum of positive squares in 2 ways, for example, as 2872316836 + 1349239824 = 53594^2 + 36732^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105538897 + ... + 105538936.

It is an arithmetic number, because the mean of its divisors is an integer number (738772419).

Almost surely, 2^4221556660 is an apocalyptic number.

It is an amenable number.

4221556660 is an abundant number, since it is smaller than the sum of its proper divisors (4643712368).

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

4221556660 is a wasteful number, since it uses less digits than its factorization.

4221556660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211077842 (or 211077840 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 4221556660 is about 64973.5073703121. The cubic root of 4221556660 is about 1616.1842649448.

The spelling of 4221556660 in words is "four billion, two hundred twenty-one million, five hundred fifty-six thousand, six hundred sixty".