66726739193 has 2 divisors, whose sum is σ = 66726739194. Its totient is φ = 66726739192.

The previous prime is 66726739159. The next prime is 66726739207. The reversal of 66726739193 is 39193762766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60460908544 + 6265830649 = 245888^2 + 79157^2 .

It is a cyclic number.

It is not a de Polignac number, because 66726739193 - 2⁶ = 66726739129 is a prime.

It is not a weakly prime, because it can be changed into another prime (66726739493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33363369596 + 33363369597.

It is an arithmetic number, because the mean of its divisors is an integer number (33363369597).

Almost surely, 2^66726739193 is an apocalyptic number.

It is an amenable number.

66726739193 is a deficient number, since it is larger than the sum of its proper divisors (1).

66726739193 is an equidigital number, since it uses as much as digits as its factorization.

66726739193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15431472, while the sum is 59.

It can be divided in two parts, 6672673 and 9193, that added together give a palindrome (6681866).

The spelling of 66726739193 in words is "sixty-six billion, seven hundred twenty-six million, seven hundred thirty-nine thousand, one hundred ninety-three".