1266266655481 has 2 divisors, whose sum is σ = 1266266655482. Its totient is φ = 1266266655480.

The previous prime is 1266266655463. The next prime is 1266266655491. The reversal of 1266266655481 is 1845566626621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765546252025 + 500720403456 = 874955^2 + 707616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266266655481 - 2¹¹ = 1266266653433 is a prime.

It is a super-2 number, since 2×1266266655481² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1266266655491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633133327740 + 633133327741.

It is an arithmetic number, because the mean of its divisors is an integer number (633133327741).

Almost surely, 2^{1266266655481} is an apocalyptic number.

It is an amenable number.

1266266655481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266266655481 is an equidigital number, since it uses as much as digits as its factorization.

1266266655481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24883200, while the sum is 58.

The spelling of 1266266655481 in words is "one trillion, two hundred sixty-six billion, two hundred sixty-six million, six hundred fifty-five thousand, four hundred eighty-one".