211161006566 has 4 divisors (see below), whose sum is σ = 316741509852. Its totient is φ = 105580503282.

The previous prime is 211161006559. The next prime is 211161006583. The reversal of 211161006566 is 665600161112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×211161006566² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 52790251640 + ... + 52790251643.

It is an arithmetic number, because the mean of its divisors is an integer number (79185377463).

Almost surely, 2^211161006566 is an apocalyptic number.

211161006566 is a deficient number, since it is larger than the sum of its proper divisors (105580503286).

211161006566 is a wasteful number, since it uses less digits than its factorization.

211161006566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105580503285.

The product of its (nonzero) digits is 12960, while the sum is 35.

Adding to 211161006566 its reverse (665600161112), we get a palindrome (876761167678).

The spelling of 211161006566 in words is "two hundred eleven billion, one hundred sixty-one million, six thousand, five hundred sixty-six".