7221565993 has 8 divisors (see below), whose sum is σ = 7489801800. Its totient is φ = 6954611328.

The previous prime is 7221565969. The next prime is 7221566021. The reversal of 7221565993 is 3995651227.

It can be written as a sum of positive squares in 4 ways, for example, as 418120704 + 6803445289 = 20448^2 + 82483^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7221565993 - 2¹³ = 7221557801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221565903) 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, 308796 + ... + 331357.

It is an arithmetic number, because the mean of its divisors is an integer number (936225225).

Almost surely, 2^7221565993 is an apocalyptic number.

It is an amenable number.

7221565993 is a deficient number, since it is larger than the sum of its proper divisors (268235807).

7221565993 is a wasteful number, since it uses less digits than its factorization.

7221565993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640571.

The product of its digits is 1020600, while the sum is 49.

The square root of 7221565993 is about 84979.7975580079. The cubic root of 7221565993 is about 1932.9047861445.

The spelling of 7221565993 in words is "seven billion, two hundred twenty-one million, five hundred sixty-five thousand, nine hundred ninety-three".