13155865287 has 4 divisors (see below), whose sum is σ = 17541153720. Its totient is φ = 8770576856.

The previous prime is 13155865249. The next prime is 13155865291. The reversal of 13155865287 is 78256855131.

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

It is a cyclic number.

It is not a de Polignac number, because 13155865287 - 2⁶ = 13155865223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13155865207) 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, 2192644212 + ... + 2192644217.

It is an arithmetic number, because the mean of its divisors is an integer number (4385288430).

Almost surely, 2^13155865287 is an apocalyptic number.

13155865287 is a deficient number, since it is larger than the sum of its proper divisors (4385288433).

13155865287 is an equidigital number, since it uses as much as digits as its factorization.

13155865287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385288432.

The product of its digits is 2016000, while the sum is 51.

The spelling of 13155865287 in words is "thirteen billion, one hundred fifty-five million, eight hundred sixty-five thousand, two hundred eighty-seven".