266947888861 has 2 divisors, whose sum is σ = 266947888862. Its totient is φ = 266947888860.

The previous prime is 266947888811. The next prime is 266947888927. The reversal of 266947888861 is 168888749662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165979648836 + 100968240025 = 407406^2 + 317755^2 .

It is a cyclic number.

It is not a de Polignac number, because 266947888861 - 2¹³ = 266947880669 is a prime.

It is a super-2 number, since 2×266947888861² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266947888811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133473944430 + 133473944431.

It is an arithmetic number, because the mean of its divisors is an integer number (133473944431).

Almost surely, 2^266947888861 is an apocalyptic number.

It is an amenable number.

266947888861 is a deficient number, since it is larger than the sum of its proper divisors (1).

266947888861 is an equidigital number, since it uses as much as digits as its factorization.

266947888861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 445906944, while the sum is 73.

The spelling of 266947888861 in words is "two hundred sixty-six billion, nine hundred forty-seven million, eight hundred eighty-eight thousand, eight hundred sixty-one".