7221136553 has 2 divisors, whose sum is σ = 7221136554. Its totient is φ = 7221136552.

The previous prime is 7221136543. The next prime is 7221136577. The reversal of 7221136553 is 3556311227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6758155264 + 462981289 = 82208^2 + 21517^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221136553 - 2⁸ = 7221136297 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221136543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610568276 + 3610568277.

It is an arithmetic number, because the mean of its divisors is an integer number (3610568277).

Almost surely, 2^7221136553 is an apocalyptic number.

It is an amenable number.

7221136553 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221136553 is an equidigital number, since it uses as much as digits as its factorization.

7221136553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 7221136553 is about 84977.2708022563. The cubic root of 7221136553 is about 1932.8664711361.

The spelling of 7221136553 in words is "seven billion, two hundred twenty-one million, one hundred thirty-six thousand, five hundred fifty-three".