212660566605 has 12 divisors (see below), whose sum is σ = 368611648860. Its totient is φ = 113418968832.

The previous prime is 212660566603. The next prime is 212660566627. The reversal of 212660566605 is 506665066212.

It is a happy number.

212660566605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 95405001129 + 117255565476 = 308877^2 + 342426^2 .

It is not a de Polignac number, because 212660566605 - 2¹ = 212660566603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4725790369 = 212660566605 / (2 + 1 + 2 + 6 + 6 + 0 + 5 + 6 + 6 + 6 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212660566603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2362895140 + ... + 2362895229.

It is an arithmetic number, because the mean of its divisors is an integer number (30717637405).

Almost surely, 2^212660566605 is an apocalyptic number.

It is an amenable number.

212660566605 is a deficient number, since it is larger than the sum of its proper divisors (155951082255).

212660566605 is a wasteful number, since it uses less digits than its factorization.

212660566605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725790380 (or 4725790377 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 212660566605 in words is "two hundred twelve billion, six hundred sixty million, five hundred sixty-six thousand, six hundred five".