211161808869 has 16 divisors (see below), whose sum is σ = 312939630144. Its totient is φ = 125562195200.

The previous prime is 211161808849. The next prime is 211161808873. The reversal of 211161808869 is 968808161112.

It is a cyclic number.

It is not a de Polignac number, because 211161808869 - 2²⁴ = 211145031653 is a prime.

It is a super-2 number, since 2×211161808869² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211161808849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60364692 + ... + 60368189.

It is an arithmetic number, because the mean of its divisors is an integer number (19558726884).

Almost surely, 2^211161808869 is an apocalyptic number.

It is an amenable number.

211161808869 is a deficient number, since it is larger than the sum of its proper divisors (101777821275).

211161808869 is a wasteful number, since it uses less digits than its factorization.

211161808869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120732948.

The product of its (nonzero) digits is 331776, while the sum is 51.

The spelling of 211161808869 in words is "two hundred eleven billion, one hundred sixty-one million, eight hundred eight thousand, eight hundred sixty-nine".