211100055666 has 16 divisors (see below), whose sum is σ = 422204724000. Its totient is φ = 70365916448.

The previous prime is 211100055643. The next prime is 211100055671. The reversal of 211100055666 is 666550001112.

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, 784750 + ... + 1018838.

It is an arithmetic number, because the mean of its divisors is an integer number (26387795250).

Almost surely, 2^211100055666 is an apocalyptic number.

211100055666 is an abundant number, since it is smaller than the sum of its proper divisors (211104668334).

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

211100055666 is a wasteful number, since it uses less digits than its factorization.

211100055666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384393.

The product of its (nonzero) digits is 10800, while the sum is 33.

Adding to 211100055666 its reverse (666550001112), we get a palindrome (877650056778).

The spelling of 211100055666 in words is "two hundred eleven billion, one hundred million, fifty-five thousand, six hundred sixty-six".