211406465665 has 16 divisors (see below), whose sum is σ = 262216877760. Its totient is φ = 163533078720.

The previous prime is 211406465651. The next prime is 211406465681. The reversal of 211406465665 is 566564604112.

It is not a de Polignac number, because 211406465665 - 2¹¹ = 211406463617 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 5856039 + ... + 5892028.

It is an arithmetic number, because the mean of its divisors is an integer number (16388554860).

Almost surely, 2^211406465665 is an apocalyptic number.

It is an amenable number.

211406465665 is a deficient number, since it is larger than the sum of its proper divisors (50810412095).

211406465665 is a wasteful number, since it uses less digits than its factorization.

211406465665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11748192.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 211406465665 in words is "two hundred eleven billion, four hundred six million, four hundred sixty-five thousand, six hundred sixty-five".