16271005516861 has 2 divisors, whose sum is σ = 16271005516862. Its totient is φ = 16271005516860.

The previous prime is 16271005516853. The next prime is 16271005516889. The reversal of 16271005516861 is 16861550017261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10156236003225 + 6114769513636 = 3186885^2 + 2472806^2 .

It is a cyclic number.

It is not a de Polignac number, because 16271005516861 - 2³ = 16271005516853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16271005516811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8135502758430 + 8135502758431.

It is an arithmetic number, because the mean of its divisors is an integer number (8135502758431).

Almost surely, 2^{16271005516861} is an apocalyptic number.

It is an amenable number.

16271005516861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16271005516861 is an equidigital number, since it uses as much as digits as its factorization.

16271005516861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 16271005516861 in words is "sixteen trillion, two hundred seventy-one billion, five million, five hundred sixteen thousand, eight hundred sixty-one".