216164612646205 has 4 divisors (see below), whose sum is σ = 259397535175452. Its totient is φ = 172931690116960.

The previous prime is 216164612646193. The next prime is 216164612646239. The reversal of 216164612646205 is 502646216461612.

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 78698437833796 + 137466174812409 = 8871214^2 + 11724597^2 .

It is not a de Polignac number, because 216164612646205 - 2¹⁵ = 216164612613437 is a prime.

It is a super-2 number, since 2×216164612646205² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21616461264616 + ... + 21616461264625.

It is an arithmetic number, because the mean of its divisors is an integer number (64849383793863).

Almost surely, 2^{216164612646205} is an apocalyptic number.

It is an amenable number.

216164612646205 is a deficient number, since it is larger than the sum of its proper divisors (43232922529247).

216164612646205 is an equidigital number, since it uses as much as digits as its factorization.

216164612646205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43232922529246.

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 216164612646205 in words is "two hundred sixteen trillion, one hundred sixty-four billion, six hundred twelve million, six hundred forty-six thousand, two hundred five".