13688039581 has 4 divisors (see below), whose sum is σ = 13699106332. Its totient is φ = 13676972832.

The previous prime is 13688039567. The next prime is 13688039591. The reversal of 13688039581 is 18593088631.

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 7592333956 + 6095705625 = 87134^2 + 78075^2 .

It is a cyclic number.

It is not a de Polignac number, because 13688039581 - 2¹⁹ = 13687515293 is a prime.

It is a super-2 number, since 2×13688039581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13688039591) 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, 5531520 + ... + 5533993.

It is an arithmetic number, because the mean of its divisors is an integer number (3424776583).

Almost surely, 2^13688039581 is an apocalyptic number.

It is an amenable number.

13688039581 is a deficient number, since it is larger than the sum of its proper divisors (11066751).

13688039581 is a wasteful number, since it uses less digits than its factorization.

13688039581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11066750.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 13688039581 in words is "thirteen billion, six hundred eighty-eight million, thirty-nine thousand, five hundred eighty-one".