16867318081 has 2 divisors, whose sum is σ = 16867318082. Its totient is φ = 16867318080.

The previous prime is 16867318067. The next prime is 16867318121. The reversal of 16867318081 is 18081376861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13996073025 + 2871245056 = 118305^2 + 53584^2 .

It is a cyclic number.

It is not a de Polignac number, because 16867318081 - 2²⁵ = 16833763649 is a prime.

It is a super-2 number, since 2×16867318081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16867318031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8433659040 + 8433659041.

It is an arithmetic number, because the mean of its divisors is an integer number (8433659041).

Almost surely, 2^16867318081 is an apocalyptic number.

It is an amenable number.

16867318081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16867318081 is an equidigital number, since it uses as much as digits as its factorization.

16867318081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 16867318081 in words is "sixteen billion, eight hundred sixty-seven million, three hundred eighteen thousand, eighty-one".