1266628750289 has 4 divisors (see below), whose sum is σ = 1447575714624. Its totient is φ = 1085681785956.

The previous prime is 1266628750271. The next prime is 1266628750291. The reversal of 1266628750289 is 9820578266621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1266628750289 - 2²⁸ = 1266360314833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266628750229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90473482157 + ... + 90473482170.

It is an arithmetic number, because the mean of its divisors is an integer number (361893928656).

Almost surely, 2^{1266628750289} is an apocalyptic number.

It is an amenable number.

1266628750289 is a deficient number, since it is larger than the sum of its proper divisors (180946964335).

1266628750289 is an equidigital number, since it uses as much as digits as its factorization.

1266628750289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180946964334.

The product of its (nonzero) digits is 34836480, while the sum is 62.

The spelling of 1266628750289 in words is "one trillion, two hundred sixty-six billion, six hundred twenty-eight million, seven hundred fifty thousand, two hundred eighty-nine".