16617718108891 has 2 divisors, whose sum is σ = 16617718108892. Its totient is φ = 16617718108890.

The previous prime is 16617718108813. The next prime is 16617718108897. The reversal of 16617718108891 is 19880181771661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16617718108891 - 2¹⁹ = 16617717584603 is a prime.

It is a super-2 number, since 2×16617718108891² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16617718108897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8308859054445 + 8308859054446.

It is an arithmetic number, because the mean of its divisors is an integer number (8308859054446).

Almost surely, 2^{16617718108891} is an apocalyptic number.

16617718108891 is a deficient number, since it is larger than the sum of its proper divisors (1).

16617718108891 is an equidigital number, since it uses as much as digits as its factorization.

16617718108891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 64.

The spelling of 16617718108891 in words is "sixteen trillion, six hundred seventeen billion, seven hundred eighteen million, one hundred eight thousand, eight hundred ninety-one".