67726349209 has 2 divisors, whose sum is σ = 67726349210. Its totient is φ = 67726349208.

The previous prime is 67726349137. The next prime is 67726349267. The reversal of 67726349209 is 90294362776.

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., 63998880400 + 3727468809 = 252980^2 + 61053^2 .

It is a cyclic number.

It is not a de Polignac number, because 67726349209 - 2¹⁷ = 67726218137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67726349209.

It is not a weakly prime, because it can be changed into another prime (67726341209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33863174604 + 33863174605.

It is an arithmetic number, because the mean of its divisors is an integer number (33863174605).

Almost surely, 2^67726349209 is an apocalyptic number.

It is an amenable number.

67726349209 is a deficient number, since it is larger than the sum of its proper divisors (1).

67726349209 is an equidigital number, since it uses as much as digits as its factorization.

67726349209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6858432, while the sum is 55.

The spelling of 67726349209 in words is "sixty-seven billion, seven hundred twenty-six million, three hundred forty-nine thousand, two hundred nine".