266782223681 has 2 divisors, whose sum is σ = 266782223682. Its totient is φ = 266782223680.

The previous prime is 266782223663. The next prime is 266782223689. The reversal of 266782223681 is 186322287662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266136301456 + 645922225 = 515884^2 + 25415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266782223681 is a prime.

It is a super-2 number, since 2×266782223681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266782223689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133391111840 + 133391111841.

It is an arithmetic number, because the mean of its divisors is an integer number (133391111841).

Almost surely, 2^266782223681 is an apocalyptic number.

It is an amenable number.

266782223681 is a deficient number, since it is larger than the sum of its proper divisors (1).

266782223681 is an equidigital number, since it uses as much as digits as its factorization.

266782223681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 53.

The spelling of 266782223681 in words is "two hundred sixty-six billion, seven hundred eighty-two million, two hundred twenty-three thousand, six hundred eighty-one".