1209766125728 has 24 divisors (see below), whose sum is σ = 2384290872180. Its totient is φ = 604231936000.

The previous prime is 1209766125703. The next prime is 1209766125739. The reversal of 1209766125728 is 8275216679021.

It can be written as a sum of positive squares in 2 ways, for example, as 885608980624 + 324157145104 = 941068^2 + 569348^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20317523 + ... + 20376978.

Almost surely, 2^{1209766125728} is an apocalyptic number.

It is an amenable number.

1209766125728 is a deficient number, since it is larger than the sum of its proper divisors (1174524746452).

1209766125728 is an equidigital number, since it uses as much as digits as its factorization.

1209766125728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40695440 (or 40695432 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 1209766125728 in words is "one trillion, two hundred nine billion, seven hundred sixty-six million, one hundred twenty-five thousand, seven hundred twenty-eight".