13956178109 has 4 divisors (see below), whose sum is σ = 14437425660. Its totient is φ = 13474930560.

The previous prime is 13956178087. The next prime is 13956178151. The reversal of 13956178109 is 90187165931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90187165931 = 204311 ⋅441421.

It can be written as a sum of positive squares in 2 ways, for example, as 10721981209 + 3234196900 = 103547^2 + 56870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13956178109 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 (13956178309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240623732 + ... + 240623789.

It is an arithmetic number, because the mean of its divisors is an integer number (3609356415).

Almost surely, 2^13956178109 is an apocalyptic number.

It is an amenable number.

13956178109 is a deficient number, since it is larger than the sum of its proper divisors (481247551).

13956178109 is an equidigital number, since it uses as much as digits as its factorization.

13956178109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481247550.

The product of its (nonzero) digits is 408240, while the sum is 50.

The spelling of 13956178109 in words is "thirteen billion, nine hundred fifty-six million, one hundred seventy-eight thousand, one hundred nine".