266664440406757 has 2 divisors, whose sum is σ = 266664440406758. Its totient is φ = 266664440406756.

The previous prime is 266664440406731. The next prime is 266664440406811. The reversal of 266664440406757 is 757604044466662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242891414580676 + 23773025826081 = 15584974^2 + 4875759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266664440406757 is a prime.

It is a super-2 number, since 2×266664440406757² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266664440406692 and 266664440406701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266664440406557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133332220203378 + 133332220203379.

It is an arithmetic number, because the mean of its divisors is an integer number (133332220203379).

Almost surely, 2^{266664440406757} is an apocalyptic number.

It is an amenable number.

266664440406757 is a deficient number, since it is larger than the sum of its proper divisors (1).

266664440406757 is an equidigital number, since it uses as much as digits as its factorization.

266664440406757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 975421440, while the sum is 67.

The spelling of 266664440406757 in words is "two hundred sixty-six trillion, six hundred sixty-four billion, four hundred forty million, four hundred six thousand, seven hundred fifty-seven".