211986745778 has 16 divisors (see below), whose sum is σ = 320333862240. Its totient is φ = 105209106816.

The previous prime is 211986745777. The next prime is 211986745781. The reversal of 211986745778 is 877547689112.

It is not an unprimeable number, because it can be changed into a prime (211986745777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1314626 + ... + 1467042.

It is an arithmetic number, because the mean of its divisors is an integer number (20020866390).

Almost surely, 2^211986745778 is an apocalyptic number.

211986745778 is a deficient number, since it is larger than the sum of its proper divisors (108347116462).

211986745778 is a wasteful number, since it uses less digits than its factorization.

211986745778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157561.

The product of its digits is 47416320, while the sum is 65.

The spelling of 211986745778 in words is "two hundred eleven billion, nine hundred eighty-six million, seven hundred forty-five thousand, seven hundred seventy-eight".