211997805695 has 32 divisors (see below), whose sum is σ = 276279232320. Its totient is φ = 155235640320.

The previous prime is 211997805689. The next prime is 211997805697. The reversal of 211997805695 is 596508799112.

It is not a de Polignac number, because 211997805695 - 2¹⁶ = 211997740159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211997805697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4056491 + ... + 4108419.

It is an arithmetic number, because the mean of its divisors is an integer number (8633726010).

Almost surely, 2^211997805695 is an apocalyptic number.

211997805695 is a deficient number, since it is larger than the sum of its proper divisors (64281426625).

211997805695 is a wasteful number, since it uses less digits than its factorization.

211997805695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52475.

The product of its (nonzero) digits is 12247200, while the sum is 62.

The spelling of 211997805695 in words is "two hundred eleven billion, nine hundred ninety-seven million, eight hundred five thousand, six hundred ninety-five".