67644040329 has 10 divisors (see below), whose sum is σ = 101048504810. Its totient is φ = 45096026832.

The previous prime is 67644040307. The next prime is 67644040361. The reversal of 67644040329 is 92304044676.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 43672640400 + 23971399929 = 208980^2 + 154827^2 .

It is not a de Polignac number, because 67644040329 - 2¹⁹ = 67643516041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67644040379) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 417555724 + ... + 417555885.

It is an arithmetic number, because the mean of its divisors is an integer number (10104850481).

Almost surely, 2^67644040329 is an apocalyptic number.

It is an amenable number.

67644040329 is a deficient number, since it is larger than the sum of its proper divisors (33404464481).

67644040329 is an equidigital number, since it uses as much as digits as its factorization.

67644040329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835111621 (or 835111612 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The spelling of 67644040329 in words is "sixty-seven billion, six hundred forty-four million, forty thousand, three hundred twenty-nine".