67564644623 has 16 divisors (see below), whose sum is σ = 78454319616. Its totient is φ = 56987491680.

The previous prime is 67564644607. The next prime is 67564644673. The reversal of 67564644623 is 32644646576.

It is a Cunningham number, because it is equal to 259932²-1.

It is not a de Polignac number, because 67564644623 - 2⁴ = 67564644607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67564644673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129965 + ... + 389897.

It is an arithmetic number, because the mean of its divisors is an integer number (4903394976).

Almost surely, 2^67564644623 is an apocalyptic number.

67564644623 is a deficient number, since it is larger than the sum of its proper divisors (10889674993).

67564644623 is a wasteful number, since it uses less digits than its factorization.

67564644623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260534.

The product of its digits is 17418240, while the sum is 53.

The spelling of 67564644623 in words is "sixty-seven billion, five hundred sixty-four million, six hundred forty-four thousand, six hundred twenty-three".