13579781894109 has 8 divisors (see below), whose sum is σ = 20118195398720. Its totient is φ = 9053187929388.

The previous prime is 13579781894069. The next prime is 13579781894123. The reversal of 13579781894109 is 90149818797531.

13579781894109 is a `hidden beast` number, since 1 + 3 + 57 + 9 + 7 + 81 + 89 + 410 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-13579781894109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13579781894009) 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, 251477442457 + ... + 251477442510.

It is an arithmetic number, because the mean of its divisors is an integer number (2514774424840).

Almost surely, 2^{13579781894109} is an apocalyptic number.

It is an amenable number.

13579781894109 is a deficient number, since it is larger than the sum of its proper divisors (6538413504611).

13579781894109 is an equidigital number, since it uses as much as digits as its factorization.

13579781894109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502954884976 (or 502954884970 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 72.

The spelling of 13579781894109 in words is "thirteen trillion, five hundred seventy-nine billion, seven hundred eighty-one million, eight hundred ninety-four thousand, one hundred nine".