143666255505449 has 2 divisors, whose sum is σ = 143666255505450. Its totient is φ = 143666255505448.

The previous prime is 143666255505431. The next prime is 143666255505491. The reversal of 143666255505449 is 944505552666341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104697261980224 + 38968993525225 = 10232168^2 + 6242515^2 .

It is an emirp because it is prime and its reverse (944505552666341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143666255505449 - 2¹⁶ = 143666255439913 is a prime.

It is not a weakly prime, because it can be changed into another prime (143666255505749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71833127752724 + 71833127752725.

It is an arithmetic number, because the mean of its divisors is an integer number (71833127752725).

Almost surely, 2^{143666255505449} is an apocalyptic number.

It is an amenable number.

143666255505449 is a deficient number, since it is larger than the sum of its proper divisors (1).

143666255505449 is an equidigital number, since it uses as much as digits as its factorization.

143666255505449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560000, while the sum is 65.

The spelling of 143666255505449 in words is "one hundred forty-three trillion, six hundred sixty-six billion, two hundred fifty-five million, five hundred five thousand, four hundred forty-nine".