13161616781805 has 64 divisors (see below), whose sum is σ = 24220730419200. Its totient is φ = 6773147942400.

The previous prime is 13161616781779. The next prime is 13161616781837. The reversal of 13161616781805 is 50818761616131.

13161616781805 is a `hidden beast` number, since 1 + 3 + 1 + 6 + 1 + 616 + 7 + 8 + 18 + 0 + 5 = 666.

It is not a de Polignac number, because 13161616781805 - 2¹⁴ = 13161616765421 is a prime.

It is a super-2 number, since 2×13161616781805² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

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, 5062105 + ... + 7207505.

It is an arithmetic number, because the mean of its divisors is an integer number (378448912800).

Almost surely, 2^{13161616781805} is an apocalyptic number.

13161616781805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13161616781805 is a deficient number, since it is larger than the sum of its proper divisors (11059113637395).

13161616781805 is a wasteful number, since it uses less digits than its factorization.

13161616781805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147011 (or 2147005 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 13161616781805 in words is "thirteen trillion, one hundred sixty-one billion, six hundred sixteen million, seven hundred eighty-one thousand, eight hundred five".