13161566289872 has 320 divisors, whose sum is σ = 35431620231168. Its totient is φ = 4569246720000.

The previous prime is 13161566289797. The next prime is 13161566289979. The reversal of 13161566289872 is 27898266516131.

It is a junction number, because it is equal to n+sod(n) for n = 13161566289799 and 13161566289808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 199061843 + ... + 199127949.

Almost surely, 2^{13161566289872} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13161566289872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17715810115584).

13161566289872 is an abundant number, since it is smaller than the sum of its proper divisors (22270053941296).

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

13161566289872 is a wasteful number, since it uses less digits than its factorization.

13161566289872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66578 (or 66572 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 65.

The spelling of 13161566289872 in words is "thirteen trillion, one hundred sixty-one billion, five hundred sixty-six million, two hundred eighty-nine thousand, eight hundred seventy-two".