66808822240805 has 8 divisors (see below), whose sum is σ = 80366602795800. Its totient is φ = 53316380388096.

The previous prime is 66808822240757. The next prime is 66808822240813. The reversal of 66808822240805 is 50804222880866.

It can be written as a sum of positive squares in 4 ways, for example, as 8628265886881 + 58180556353924 = 2937391^2 + 7627618^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66808822240805 - 2²⁰ = 66808821192229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16334673320 + ... + 16334677409.

It is an arithmetic number, because the mean of its divisors is an integer number (10045825349475).

Almost surely, 2^{66808822240805} is an apocalyptic number.

It is an amenable number.

66808822240805 is a deficient number, since it is larger than the sum of its proper divisors (13557780554995).

66808822240805 is a wasteful number, since it uses less digits than its factorization.

66808822240805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32669351143.

The product of its (nonzero) digits is 23592960, while the sum is 59.

The spelling of 66808822240805 in words is "sixty-six trillion, eight hundred eight billion, eight hundred twenty-two million, two hundred forty thousand, eight hundred five".