211606306566464 has 14 divisors (see below), whose sum is σ = 419906264592954. Its totient is φ = 105803153283200.

The previous prime is 211606306566379. The next prime is 211606306566467. The reversal of 211606306566464 is 464665603606112.

It can be written as a sum of positive squares in only one way, i.e., 211423464806464 + 182841760000 = 14540408^2 + 427600^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211606306566467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1653174269987 + ... + 1653174270114.

Almost surely, 2^{211606306566464} is an apocalyptic number.

It is an amenable number.

211606306566464 is a deficient number, since it is larger than the sum of its proper divisors (208299958026490).

211606306566464 is an equidigital number, since it uses as much as digits as its factorization.

211606306566464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306348540113 (or 3306348540103 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 56.

The spelling of 211606306566464 in words is "two hundred eleven trillion, six hundred six billion, three hundred six million, five hundred sixty-six thousand, four hundred sixty-four".