13217720857616 has 40 divisors (see below), whose sum is σ = 28122471766848. Its totient is φ = 5968266480000.

The previous prime is 13217720857613. The next prime is 13217720857639. The reversal of 13217720857616 is 61675802771231.

It is not an unprimeable number, because it can be changed into a prime (13217720857613) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 248651195 + ... + 248704346.

Almost surely, 2^{13217720857616} is an apocalyptic number.

13217720857616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13217720857616 is an abundant number, since it is smaller than the sum of its proper divisors (14904750909232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13217720857616 is a wasteful number, since it uses less digits than its factorization.

13217720857616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497355711 (or 497355705 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 56.

The spelling of 13217720857616 in words is "thirteen trillion, two hundred seventeen billion, seven hundred twenty million, eight hundred fifty-seven thousand, six hundred sixteen".