211476766681 has 2 divisors, whose sum is σ = 211476766682. Its totient is φ = 211476766680.

The previous prime is 211476766661. The next prime is 211476766747. The reversal of 211476766681 is 186667674112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200219556681 + 11257210000 = 447459^2 + 106100^2 .

It is a cyclic number.

It is not a de Polignac number, because 211476766681 - 2²⁷ = 211342548953 is a prime.

It is a super-2 number, since 2×211476766681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211476766601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105738383340 + 105738383341.

It is an arithmetic number, because the mean of its divisors is an integer number (105738383341).

Almost surely, 2^211476766681 is an apocalyptic number.

It is an amenable number.

211476766681 is a deficient number, since it is larger than the sum of its proper divisors (1).

211476766681 is an equidigital number, since it uses as much as digits as its factorization.

211476766681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The spelling of 211476766681 in words is "two hundred eleven billion, four hundred seventy-six million, seven hundred sixty-six thousand, six hundred eighty-one".