211986745786 has 8 divisors (see below), whose sum is σ = 318797549460. Its totient is φ = 105720895968.

The previous prime is 211986745781. The next prime is 211986745787. The reversal of 211986745786 is 687547689112.

211986745786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 203925399561 + 8061346225 = 451581^2 + 89785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (211986745781) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 136237491 + ... + 136239046.

Almost surely, 2^211986745786 is an apocalyptic number.

211986745786 is a deficient number, since it is larger than the sum of its proper divisors (106810803674).

211986745786 is a wasteful number, since it uses less digits than its factorization.

211986745786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272476928.

The product of its digits is 40642560, while the sum is 64.

The spelling of 211986745786 in words is "two hundred eleven billion, nine hundred eighty-six million, seven hundred forty-five thousand, seven hundred eighty-six".