67643243873 has 4 divisors (see below), whose sum is σ = 67644371220. Its totient is φ = 67642116528.

The previous prime is 67643243861. The next prime is 67643243887. The reversal of 67643243873 is 37834234676.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62716186624 + 4927057249 = 250432^2 + 70193^2 .

It is a cyclic number.

It is not a de Polignac number, because 67643243873 - 2¹⁸ = 67642981729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67643233873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468290 + ... + 595467.

It is an arithmetic number, because the mean of its divisors is an integer number (16911092805).

Almost surely, 2^67643243873 is an apocalyptic number.

It is an amenable number.

67643243873 is a deficient number, since it is larger than the sum of its proper divisors (1127347).

67643243873 is a wasteful number, since it uses less digits than its factorization.

67643243873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127346.

The product of its digits is 12192768, while the sum is 53.

The spelling of 67643243873 in words is "sixty-seven billion, six hundred forty-three million, two hundred forty-three thousand, eight hundred seventy-three".