13681345613 has 4 divisors (see below), whose sum is σ = 14733756828. Its totient is φ = 12628934400.

The previous prime is 13681345597. The next prime is 13681345621. The reversal of 13681345613 is 31654318631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7953429124 + 5727916489 = 89182^2 + 75683^2 .

It is a cyclic number.

It is not a de Polignac number, because 13681345613 - 2⁴ = 13681345597 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 (13681344613) 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, 526205588 + ... + 526205613.

It is an arithmetic number, because the mean of its divisors is an integer number (3683439207).

Almost surely, 2^13681345613 is an apocalyptic number.

13681345613 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13681345613 is a deficient number, since it is larger than the sum of its proper divisors (1052411215).

13681345613 is a wasteful number, since it uses less digits than its factorization.

13681345613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052411214.

The product of its digits is 155520, while the sum is 41.

The spelling of 13681345613 in words is "thirteen billion, six hundred eighty-one million, three hundred forty-five thousand, six hundred thirteen".