16004561117 has 2 divisors, whose sum is σ = 16004561118. Its totient is φ = 16004561116.

The previous prime is 16004561113. The next prime is 16004561189. The reversal of 16004561117 is 71116540061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14406240676 + 1598320441 = 120026^2 + 39979^2 .

It is a cyclic number.

It is not a de Polignac number, because 16004561117 - 2² = 16004561113 is a prime.

It is a super-2 number, since 2×16004561117² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16004561113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8002280558 + 8002280559.

It is an arithmetic number, because the mean of its divisors is an integer number (8002280559).

Almost surely, 2^16004561117 is an apocalyptic number.

It is an amenable number.

16004561117 is a deficient number, since it is larger than the sum of its proper divisors (1).

16004561117 is an equidigital number, since it uses as much as digits as its factorization.

16004561117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 16004561117 in words is "sixteen billion, four million, five hundred sixty-one thousand, one hundred seventeen".