66562321193 has 2 divisors, whose sum is σ = 66562321194. Its totient is φ = 66562321192.

The previous prime is 66562321171. The next prime is 66562321201. The reversal of 66562321193 is 39112326566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42994851904 + 23567469289 = 207352^2 + 153517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66562321193 is a prime.

It is not a weakly prime, because it can be changed into another prime (66562921193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281160596 + 33281160597.

It is an arithmetic number, because the mean of its divisors is an integer number (33281160597).

Almost surely, 2^66562321193 is an apocalyptic number.

It is an amenable number.

66562321193 is a deficient number, since it is larger than the sum of its proper divisors (1).

66562321193 is an equidigital number, since it uses as much as digits as its factorization.

66562321193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The spelling of 66562321193 in words is "sixty-six billion, five hundred sixty-two million, three hundred twenty-one thousand, one hundred ninety-three".