7221716231617 has 2 divisors, whose sum is σ = 7221716231618. Its totient is φ = 7221716231616.

The previous prime is 7221716231581. The next prime is 7221716231641. The reversal of 7221716231617 is 7161326171227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4405230090496 + 2816486141121 = 2098864^2 + 1678239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221716231617 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221716231117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610858115808 + 3610858115809.

It is an arithmetic number, because the mean of its divisors is an integer number (3610858115809).

Almost surely, 2^{7221716231617} is an apocalyptic number.

It is an amenable number.

7221716231617 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221716231617 is an equidigital number, since it uses as much as digits as its factorization.

7221716231617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

The spelling of 7221716231617 in words is "seven trillion, two hundred twenty-one billion, seven hundred sixteen million, two hundred thirty-one thousand, six hundred seventeen".