13155685087009 has 4 divisors (see below), whose sum is σ = 13157079741316. Its totient is φ = 13154290432704.

The previous prime is 13155685086949. The next prime is 13155685087081. The reversal of 13155685087009 is 90078058655131.

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 11566610544784 + 1589074542225 = 3400972^2 + 1260585^2 .

It is a cyclic number.

It is not a de Polignac number, because 13155685087009 - 2¹³ = 13155685078817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13155685085009) 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, 697313004 + ... + 697331869.

It is an arithmetic number, because the mean of its divisors is an integer number (3289269935329).

Almost surely, 2^{13155685087009} is an apocalyptic number.

It is an amenable number.

13155685087009 is a deficient number, since it is larger than the sum of its proper divisors (1394654307).

13155685087009 is an equidigital number, since it uses as much as digits as its factorization.

13155685087009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394654306.

The product of its (nonzero) digits is 9072000, while the sum is 58.

The spelling of 13155685087009 in words is "thirteen trillion, one hundred fifty-five billion, six hundred eighty-five million, eighty-seven thousand, nine".