16566172041439 has 2 divisors, whose sum is σ = 16566172041440. Its totient is φ = 16566172041438.

The previous prime is 16566172041373. The next prime is 16566172041449. The reversal of 16566172041439 is 93414027166561.

16566172041439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (93414027166561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16566172041439 - 2²⁷ = 16566037823711 is a prime.

It is a super-2 number, since 2×16566172041439² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16566172041439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16566172041449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8283086020719 + 8283086020720.

It is an arithmetic number, because the mean of its divisors is an integer number (8283086020720).

Almost surely, 2^{16566172041439} is an apocalyptic number.

16566172041439 is a deficient number, since it is larger than the sum of its proper divisors (1).

16566172041439 is an equidigital number, since it uses as much as digits as its factorization.

16566172041439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 16566172041439 in words is "sixteen trillion, five hundred sixty-six billion, one hundred seventy-two million, forty-one thousand, four hundred thirty-nine".