1266881081782 has 4 divisors (see below), whose sum is σ = 1900321622676. Its totient is φ = 633440540890.

The previous prime is 1266881081771. The next prime is 1266881081827. The reversal of 1266881081782 is 2871801886621.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316720270444 + ... + 316720270447.

It is an arithmetic number, because the mean of its divisors is an integer number (475080405669).

Almost surely, 2^{1266881081782} is an apocalyptic number.

1266881081782 is a deficient number, since it is larger than the sum of its proper divisors (633440540894).

1266881081782 is an equidigital number, since it uses as much as digits as its factorization.

1266881081782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633440540893.

The product of its (nonzero) digits is 4128768, while the sum is 58.

The spelling of 1266881081782 in words is "one trillion, two hundred sixty-six billion, eight hundred eighty-one million, eighty-one thousand, seven hundred eighty-two".