16566172041449 has 2 divisors, whose sum is σ = 16566172041450. Its totient is φ = 16566172041448.

The previous prime is 16566172041439. The next prime is 16566172041481. The reversal of 16566172041449 is 94414027166561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15994144535824 + 572027505625 = 3999268^2 + 756325^2 .

It is a cyclic number.

It is not a de Polignac number, because 16566172041449 - 2²⁴ = 16566155264233 is a prime.

It is a super-2 number, since 2×16566172041449² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16566172041394 and 16566172041403.

It is not a weakly prime, because it can be changed into another prime (16566172041439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8283086020724 + 8283086020725.

It is an arithmetic number, because the mean of its divisors is an integer number (8283086020725).

Almost surely, 2^{16566172041449} is an apocalyptic number.

It is an amenable number.

16566172041449 is a deficient number, since it is larger than the sum of its proper divisors (1).

16566172041449 is an equidigital number, since it uses as much as digits as its factorization.

16566172041449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 16566172041449 in words is "sixteen trillion, five hundred sixty-six billion, one hundred seventy-two million, forty-one thousand, four hundred forty-nine".