1261285775875 has 16 divisors (see below), whose sum is σ = 1574129531520. Its totient is φ = 1008999849600.

The previous prime is 1261285775857. The next prime is 1261285775909. The reversal of 1261285775875 is 5785775821621.

It is not a de Polignac number, because 1261285775875 - 2¹¹ = 1261285773827 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4986459 + ... + 5233291.

It is an arithmetic number, because the mean of its divisors is an integer number (98383095720).

Almost surely, 2^{1261285775875} is an apocalyptic number.

1261285775875 is a deficient number, since it is larger than the sum of its proper divisors (312843755645).

1261285775875 is an equidigital number, since it uses as much as digits as its factorization.

1261285775875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287727 (or 287717 counting only the distinct ones).

The product of its digits is 65856000, while the sum is 64.

The spelling of 1261285775875 in words is "one trillion, two hundred sixty-one billion, two hundred eighty-five million, seven hundred seventy-five thousand, eight hundred seventy-five".