16551555169 has 2 divisors, whose sum is σ = 16551555170. Its totient is φ = 16551555168.

The previous prime is 16551555151. The next prime is 16551555193. The reversal of 16551555169 is 96155515561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10102662144 + 6448893025 = 100512^2 + 80305^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551555169 - 2¹¹ = 16551553121 is a prime.

It is a super-2 number, since 2×16551555169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16551555199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275777584 + 8275777585.

It is an arithmetic number, because the mean of its divisors is an integer number (8275777585).

Almost surely, 2^16551555169 is an apocalyptic number.

It is an amenable number.

16551555169 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551555169 is an equidigital number, since it uses as much as digits as its factorization.

16551555169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1012500, while the sum is 49.

The spelling of 16551555169 in words is "sixteen billion, five hundred fifty-one million, five hundred fifty-five thousand, one hundred sixty-nine".