555516216161 has 2 divisors, whose sum is σ = 555516216162. Its totient is φ = 555516216160.

The previous prime is 555516216091. The next prime is 555516216209. The reversal of 555516216161 is 161612615555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353055814225 + 202460401936 = 594185^2 + 449956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-555516216161 is a prime.

It is not a weakly prime, because it can be changed into another prime (555516216061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277758108080 + 277758108081.

It is an arithmetic number, because the mean of its divisors is an integer number (277758108081).

Almost surely, 2^555516216161 is an apocalyptic number.

It is an amenable number.

555516216161 is a deficient number, since it is larger than the sum of its proper divisors (1).

555516216161 is an equidigital number, since it uses as much as digits as its factorization.

555516216161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270000, while the sum is 44.

The spelling of 555516216161 in words is "five hundred fifty-five billion, five hundred sixteen million, two hundred sixteen thousand, one hundred sixty-one".