216135516605 has 4 divisors (see below), whose sum is σ = 259362619932. Its totient is φ = 172908413280.

The previous prime is 216135516491. The next prime is 216135516607. The reversal of 216135516605 is 506615531612.

216135516605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 34327937284 + 181807579321 = 185278^2 + 426389^2 .

It is not a de Polignac number, because 216135516605 - 2¹⁶ = 216135451069 is a prime.

It is a super-2 number, since 2×216135516605² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216135516607) 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 3 ways as a sum of consecutive naturals, for example, 21613551656 + ... + 21613551665.

It is an arithmetic number, because the mean of its divisors is an integer number (64840654983).

Almost surely, 2^216135516605 is an apocalyptic number.

It is an amenable number.

216135516605 is a deficient number, since it is larger than the sum of its proper divisors (43227103327).

216135516605 is an equidigital number, since it uses as much as digits as its factorization.

216135516605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43227103326.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 216135516605 in words is "two hundred sixteen billion, one hundred thirty-five million, five hundred sixteen thousand, six hundred five".