1279287666513 has 6 divisors (see below), whose sum is σ = 1847859962754. Its totient is φ = 852858444336.

The previous prime is 1279287666497. The next prime is 1279287666541. The reversal of 1279287666513 is 3156667829721.

It can be written as a sum of positive squares in only one way, i.e., 754000462224 + 525287204289 = 868332^2 + 724767^2 .

It is not a de Polignac number, because 1279287666513 - 2⁴ = 1279287666497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1279287666583) 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 5 ways as a sum of consecutive naturals, for example, 71071537020 + ... + 71071537037.

It is an arithmetic number, because the mean of its divisors is an integer number (307976660459).

Almost surely, 2^{1279287666513} is an apocalyptic number.

It is an amenable number.

1279287666513 is a deficient number, since it is larger than the sum of its proper divisors (568572296241).

1279287666513 is a wasteful number, since it uses less digits than its factorization.

1279287666513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142143074063 (or 142143074060 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 1279287666513 in words is "one trillion, two hundred seventy-nine billion, two hundred eighty-seven million, six hundred sixty-six thousand, five hundred thirteen".