13217692885256 has 16 divisors (see below), whose sum is σ = 24783369081900. Its totient is φ = 6608794463424.

The previous prime is 13217692885249. The next prime is 13217692885261. The reversal of 13217692885256 is 65258829671231.

It can be written as a sum of positive squares in 2 ways, for example, as 11620831016356 + 1596861868900 = 3408934^2 + 1263670^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13217692885192 and 13217692885201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5405891 + ... + 7460498.

Almost surely, 2^{13217692885256} is an apocalyptic number.

It is an amenable number.

13217692885256 is a deficient number, since it is larger than the sum of its proper divisors (11565676196644).

13217692885256 is a wasteful number, since it uses less digits than its factorization.

13217692885256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12994808 (or 12994804 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 65.

The spelling of 13217692885256 in words is "thirteen trillion, two hundred seventeen billion, six hundred ninety-two million, eight hundred eighty-five thousand, two hundred fifty-six".