67644504005 has 16 divisors (see below), whose sum is σ = 87422993280. Its totient is φ = 49949732928.

The previous prime is 67644504001. The next prime is 67644504013. The reversal of 67644504005 is 50040544676.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 67644504005 - 2² = 67644504001 is a prime.

It is a super-2 number, since 2×67644504005² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67644504001) 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, 1786904 + ... + 1824366.

It is an arithmetic number, because the mean of its divisors is an integer number (5463937080).

Almost surely, 2^67644504005 is an apocalyptic number.

67644504005 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

67644504005 is a deficient number, since it is larger than the sum of its proper divisors (19778489275).

67644504005 is a wasteful number, since it uses less digits than its factorization.

67644504005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65260.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 67644504005 in words is "sixty-seven billion, six hundred forty-four million, five hundred four thousand, five".