13506878989 has 8 divisors (see below), whose sum is σ = 13633440920. Its totient is φ = 13380365376.

The previous prime is 13506878953. The next prime is 13506878999. The reversal of 13506878989 is 98987860531.

It can be written as a sum of positive squares in 4 ways, for example, as 7962885225 + 5543993764 = 89235^2 + 74458^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13506878989 - 2⁹ = 13506878477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13506878989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13506878939) 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, 806707 + ... + 823279.

It is an arithmetic number, because the mean of its divisors is an integer number (1704180115).

Almost surely, 2^13506878989 is an apocalyptic number.

It is an amenable number.

13506878989 is a deficient number, since it is larger than the sum of its proper divisors (126561931).

13506878989 is a wasteful number, since it uses less digits than its factorization.

13506878989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24159.

The product of its (nonzero) digits is 26127360, while the sum is 64.

The spelling of 13506878989 in words is "thirteen billion, five hundred six million, eight hundred seventy-eight thousand, nine hundred eighty-nine".