7221545556 has 24 divisors (see below), whose sum is σ = 16870820064. Its totient is φ = 2404246560.

The previous prime is 7221545503. The next prime is 7221545557. The reversal of 7221545556 is 6555451227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221545557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356650 + ... + 376353.

It is an arithmetic number, because the mean of its divisors is an integer number (702950836).

Almost surely, 2^7221545556 is an apocalyptic number.

It is an amenable number.

7221545556 is an abundant number, since it is smaller than the sum of its proper divisors (9649274508).

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

7221545556 is a wasteful number, since it uses less digits than its factorization.

7221545556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733831 (or 733829 counting only the distinct ones).

The product of its digits is 420000, while the sum is 42.

The square root of 7221545556 is about 84979.6773116961. The cubic root of 7221545556 is about 1932.9029627721.

The spelling of 7221545556 in words is "seven billion, two hundred twenty-one million, five hundred forty-five thousand, five hundred fifty-six".