1266276681 has 6 divisors (see below), whose sum is σ = 1829066330. Its totient is φ = 844184448.

The previous prime is 1266276659. The next prime is 1266276719. The reversal of 1266276681 is 1866726621.

1266276681 is a `hidden beast` number, since 12 + 6 + 627 + 6 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1058916681 + 207360000 = 32541^2 + 14400^2 .

It is not a de Polignac number, because 1266276681 - 2²⁷ = 1132058953 is a prime.

It is a super-2 number, since 2×1266276681² = 3206913265688751522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266276611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70348696 + ... + 70348713.

Almost surely, 2^1266276681 is an apocalyptic number.

It is an amenable number.

1266276681 is a deficient number, since it is larger than the sum of its proper divisors (562789649).

1266276681 is a wasteful number, since it uses less digits than its factorization.

1266276681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140697415 (or 140697412 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 1266276681 is about 35584.7815926977. The cubic root of 1266276681 is about 1081.8728024950.

The spelling of 1266276681 in words is "one billion, two hundred sixty-six million, two hundred seventy-six thousand, six hundred eighty-one".