211986745777 has 2 divisors, whose sum is σ = 211986745778. Its totient is φ = 211986745776.

The previous prime is 211986745739. The next prime is 211986745781. The reversal of 211986745777 is 777547689112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211964476816 + 22268961 = 460396^2 + 4719^2 .

It is a cyclic number.

It is not a de Polignac number, because 211986745777 - 2¹¹ = 211986743729 is a prime.

It is not a weakly prime, because it can be changed into another prime (211986745787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105993372888 + 105993372889.

It is an arithmetic number, because the mean of its divisors is an integer number (105993372889).

Almost surely, 2^211986745777 is an apocalyptic number.

It is an amenable number.

211986745777 is a deficient number, since it is larger than the sum of its proper divisors (1).

211986745777 is an equidigital number, since it uses as much as digits as its factorization.

211986745777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41489280, while the sum is 64.

The spelling of 211986745777 in words is "two hundred eleven billion, nine hundred eighty-six million, seven hundred forty-five thousand, seven hundred seventy-seven".