1261250355268 has 12 divisors (see below), whose sum is σ = 2215042885692. Its totient is φ = 628380959360.

The previous prime is 1261250355251. The next prime is 1261250355373. The reversal of 1261250355268 is 8625530521621.

It can be written as a sum of positive squares in 2 ways, for example, as 921603840004 + 339646515264 = 960002^2 + 582792^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561053305 + ... + 561055552.

It is an arithmetic number, because the mean of its divisors is an integer number (184586907141).

Almost surely, 2^{1261250355268} is an apocalyptic number.

It is an amenable number.

1261250355268 is a deficient number, since it is larger than the sum of its proper divisors (953792530424).

1261250355268 is a wasteful number, since it uses less digits than its factorization.

1261250355268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122109142 (or 1122109140 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 46.

Adding to 1261250355268 its reverse (8625530521621), we get a palindrome (9886780876889).

The spelling of 1261250355268 in words is "one trillion, two hundred sixty-one billion, two hundred fifty million, three hundred fifty-five thousand, two hundred sixty-eight".