1266275705 has 4 divisors (see below), whose sum is σ = 1519530852. Its totient is φ = 1013020560.

The previous prime is 1266275701. The next prime is 1266275707. The reversal of 1266275705 is 5075726621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5075726621 = 7 ⋅725103803.

It can be written as a sum of positive squares in 2 ways, for example, as 157452304 + 1108823401 = 12548^2 + 33299^2 .

It is not a de Polignac number, because 1266275705 - 2² = 1266275701 is a prime.

It is a super-2 number, since 2×1266275705² = 3206908322146494050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266275701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126627566 + ... + 126627575.

It is an arithmetic number, because the mean of its divisors is an integer number (379882713).

Almost surely, 2^1266275705 is an apocalyptic number.

It is an amenable number.

1266275705 is a deficient number, since it is larger than the sum of its proper divisors (253255147).

1266275705 is an equidigital number, since it uses as much as digits as its factorization.

1266275705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253255146.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 1266275705 is about 35584.7678789675. The cubic root of 1266275705 is about 1081.8725245388.

The spelling of 1266275705 in words is "one billion, two hundred sixty-six million, two hundred seventy-five thousand, seven hundred five".