16556304361 has 2 divisors, whose sum is σ = 16556304362. Its totient is φ = 16556304360.

The previous prime is 16556304329. The next prime is 16556304377. The reversal of 16556304361 is 16340365561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9284478736 + 7271825625 = 96356^2 + 85275^2 .

It is a cyclic number.

It is not a de Polignac number, because 16556304361 - 2⁵ = 16556304329 is a prime.

It is a super-2 number, since 2×16556304361² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16556304311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278152180 + 8278152181.

It is an arithmetic number, because the mean of its divisors is an integer number (8278152181).

Almost surely, 2^16556304361 is an apocalyptic number.

It is an amenable number.

16556304361 is a deficient number, since it is larger than the sum of its proper divisors (1).

16556304361 is an equidigital number, since it uses as much as digits as its factorization.

16556304361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 16556304361 in words is "sixteen billion, five hundred fifty-six million, three hundred four thousand, three hundred sixty-one".