66573437549 has 2 divisors, whose sum is σ = 66573437550. Its totient is φ = 66573437548.

The previous prime is 66573437519. The next prime is 66573437573. The reversal of 66573437549 is 94573437566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63509040100 + 3064397449 = 252010^2 + 55357^2 .

It is a cyclic number.

It is not a de Polignac number, because 66573437549 - 2¹⁶ = 66573372013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66573437519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286718774 + 33286718775.

It is an arithmetic number, because the mean of its divisors is an integer number (33286718775).

Almost surely, 2^66573437549 is an apocalyptic number.

It is an amenable number.

66573437549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66573437549 is an equidigital number, since it uses as much as digits as its factorization.

66573437549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57153600, while the sum is 59.

The spelling of 66573437549 in words is "sixty-six billion, five hundred seventy-three million, four hundred thirty-seven thousand, five hundred forty-nine".