211161006565 has 8 divisors (see below), whose sum is σ = 253648908288. Its totient is φ = 168758338320.

The previous prime is 211161006559. The next prime is 211161006583. The reversal of 211161006565 is 565600161112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211161006565 - 2¹⁹ = 211160482277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211161006565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21302917 + ... + 21312826.

It is an arithmetic number, because the mean of its divisors is an integer number (31706113536).

Almost surely, 2^211161006565 is an apocalyptic number.

It is an amenable number.

211161006565 is a deficient number, since it is larger than the sum of its proper divisors (42487901723).

211161006565 is an equidigital number, since it uses as much as digits as its factorization.

211161006565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42616739.

The product of its (nonzero) digits is 10800, while the sum is 34.

Adding to 211161006565 its reverse (565600161112), we get a palindrome (776761167677).

The spelling of 211161006565 in words is "two hundred eleven billion, one hundred sixty-one million, six thousand, five hundred sixty-five".