16661172208453 has 2 divisors, whose sum is σ = 16661172208454. Its totient is φ = 16661172208452.

The previous prime is 16661172208399. The next prime is 16661172208507. The reversal of 16661172208453 is 35480227116661.

It is a balanced prime because it is at equal distance from previous prime (16661172208399) and next prime (16661172208507).

It can be written as a sum of positive squares in only one way, i.e., 16619262748929 + 41909459524 = 4076673^2 + 204718^2 .

It is a cyclic number.

It is not a de Polignac number, because 16661172208453 - 2³⁷ = 16523733254981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16661172208453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16661172208553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330586104226 + 8330586104227.

It is an arithmetic number, because the mean of its divisors is an integer number (8330586104227).

Almost surely, 2^{16661172208453} is an apocalyptic number.

It is an amenable number.

16661172208453 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661172208453 is an equidigital number, since it uses as much as digits as its factorization.

16661172208453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 16661172208453 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, two hundred eight thousand, four hundred fifty-three".