212066116605 has 80 divisors (see below), whose sum is σ = 446197276800. Its totient is φ = 94324341888.

The previous prime is 212066116589. The next prime is 212066116607. The reversal of 212066116605 is 506611660212.

212066116605 is a `hidden beast` number, since 21 + 20 + 6 + 6 + 1 + 1 + 6 + 605 = 666.

It is not a de Polignac number, because 212066116605 - 2⁴ = 212066116589 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212066116605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212066116607) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 905955 + ... + 1115744.

It is an arithmetic number, because the mean of its divisors is an integer number (5577465960).

Almost surely, 2^212066116605 is an apocalyptic number.

It is an amenable number.

212066116605 is an abundant number, since it is smaller than the sum of its proper divisors (234131160195).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212066116605 is a wasteful number, since it uses less digits than its factorization.

212066116605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021760 (or 2021751 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 212066116605 its reverse (506611660212), we get a palindrome (718677776817).

The spelling of 212066116605 in words is "two hundred twelve billion, sixty-six million, one hundred sixteen thousand, six hundred five".