66446352043205 has 4 divisors (see below), whose sum is σ = 79735622451852. Its totient is φ = 53157081634560.

The previous prime is 66446352043111. The next prime is 66446352043207. The reversal of 66446352043205 is 50234025364466.

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 42221222901796 + 24225129141409 = 6497786^2 + 4921903^2 .

It is not a de Polignac number, because 66446352043205 - 2¹⁶ = 66446351977669 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 (66446352043207) 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, 6644635204316 + ... + 6644635204325.

It is an arithmetic number, because the mean of its divisors is an integer number (19933905612963).

Almost surely, 2^{66446352043205} is an apocalyptic number.

It is an amenable number.

66446352043205 is a deficient number, since it is larger than the sum of its proper divisors (13289270408647).

66446352043205 is a wasteful number, since it uses less digits than its factorization.

66446352043205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13289270408646.

The product of its (nonzero) digits is 12441600, while the sum is 50.

The spelling of 66446352043205 in words is "sixty-six trillion, four hundred forty-six billion, three hundred fifty-two million, forty-three thousand, two hundred five".