13894406681 has 4 divisors (see below), whose sum is σ = 14050523700. Its totient is φ = 13738289664.

The previous prime is 13894406671. The next prime is 13894406693. The reversal of 13894406681 is 18660449831.

13894406681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18660449831 = 137 ⋅136207663.

It can be written as a sum of positive squares in 2 ways, for example, as 4777021456 + 9117385225 = 69116^2 + 95485^2 .

It is a cyclic number.

It is not a de Polignac number, because 13894406681 - 2¹⁴ = 13894390297 is a prime.

It is a super-2 number, since 2×13894406681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13894406671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78058376 + ... + 78058553.

It is an arithmetic number, because the mean of its divisors is an integer number (3512630925).

Almost surely, 2^13894406681 is an apocalyptic number.

It is an amenable number.

13894406681 is a deficient number, since it is larger than the sum of its proper divisors (156117019).

13894406681 is an equidigital number, since it uses as much as digits as its factorization.

13894406681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156117018.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 13894406681 in words is "thirteen billion, eight hundred ninety-four million, four hundred six thousand, six hundred eighty-one".