13172389857965 has 48 divisors (see below), whose sum is σ = 18035785455408. Its totient is φ = 9179478392832.

The previous prime is 13172389857943. The next prime is 13172389857971. The reversal of 13172389857965 is 56975898327131.

It can be written as a sum of positive squares in 8 ways, for example, as 715577262724 + 12456812595241 = 845918^2 + 3529421^2 .

It is not a de Polignac number, because 13172389857965 - 2³⁸ = 12897511951021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13172389857892 and 13172389857901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4938359 + ... + 7122651.

It is an arithmetic number, because the mean of its divisors is an integer number (375745530321).

Almost surely, 2^{13172389857965} is an apocalyptic number.

It is an amenable number.

13172389857965 is a deficient number, since it is larger than the sum of its proper divisors (4863395597443).

13172389857965 is a wasteful number, since it uses less digits than its factorization.

13172389857965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184606 (or 2184587 counting only the distinct ones).

The product of its digits is 685843200, while the sum is 74.

The spelling of 13172389857965 in words is "thirteen trillion, one hundred seventy-two billion, three hundred eighty-nine million, eight hundred fifty-seven thousand, nine hundred sixty-five".