211640022566 has 12 divisors (see below), whose sum is σ = 369290243628. Its totient is φ = 90702866772.

The previous prime is 211640022551. The next prime is 211640022623. The reversal of 211640022566 is 665220046112.

211640022566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1079795936 + ... + 1079796131.

It is an arithmetic number, because the mean of its divisors is an integer number (30774186969).

Almost surely, 2^211640022566 is an apocalyptic number.

211640022566 is a deficient number, since it is larger than the sum of its proper divisors (157650221062).

211640022566 is a wasteful number, since it uses less digits than its factorization.

211640022566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159592083 (or 2159592076 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 211640022566 its reverse (665220046112), we get a palindrome (876860068678).

The spelling of 211640022566 in words is "two hundred eleven billion, six hundred forty million, twenty-two thousand, five hundred sixty-six".