211671656066571 has 16 divisors (see below), whose sum is σ = 288615836361600. Its totient is φ = 137947680264128.

The previous prime is 211671656066551. The next prime is 211671656066597. The reversal of 211671656066571 is 175660656176112.

It is a cyclic number.

It is not a de Polignac number, because 211671656066571 - 2⁷ = 211671656066443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211671656066501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3340429386 + ... + 3340492751.

It is an arithmetic number, because the mean of its divisors is an integer number (18038489772600).

Almost surely, 2^{211671656066571} is an apocalyptic number.

211671656066571 is a deficient number, since it is larger than the sum of its proper divisors (76944180295029).

211671656066571 is a wasteful number, since it uses less digits than its factorization.

211671656066571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6680922378.

The product of its (nonzero) digits is 19051200, while the sum is 60.

The spelling of 211671656066571 in words is "two hundred eleven trillion, six hundred seventy-one billion, six hundred fifty-six million, sixty-six thousand, five hundred seventy-one".