13431169916561 has 8 divisors (see below), whose sum is σ = 14170876560000. Its totient is φ = 12694743569520.

The previous prime is 13431169916441. The next prime is 13431169916569. The reversal of 13431169916561 is 16561996113431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13431169916561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13431169916497 and 13431169916506.

It is not an unprimeable number, because it can be changed into a prime (13431169916569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820065686 + ... + 820082063.

It is an arithmetic number, because the mean of its divisors is an integer number (1771359570000).

Almost surely, 2^{13431169916561} is an apocalyptic number.

It is an amenable number.

13431169916561 is a deficient number, since it is larger than the sum of its proper divisors (739706643439).

13431169916561 is a wasteful number, since it uses less digits than its factorization.

13431169916561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640148199.

The product of its digits is 3149280, while the sum is 56.

The spelling of 13431169916561 in words is "thirteen trillion, four hundred thirty-one billion, one hundred sixty-nine million, nine hundred sixteen thousand, five hundred sixty-one".