13278556987 has 4 divisors (see below), whose sum is σ = 13407475120. Its totient is φ = 13149638856.

The previous prime is 13278556927. The next prime is 13278557011. The reversal of 13278556987 is 78965587231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78965587231 = 17 ⋅4645034543.

It is a cyclic number.

It is not a de Polignac number, because 13278556987 - 2³¹ = 11131073339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13278556927) 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, 64458912 + ... + 64459117.

It is an arithmetic number, because the mean of its divisors is an integer number (3351868780).

Almost surely, 2^13278556987 is an apocalyptic number.

13278556987 is a deficient number, since it is larger than the sum of its proper divisors (128918133).

13278556987 is a wasteful number, since it uses less digits than its factorization.

13278556987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128918132.

The product of its digits is 25401600, while the sum is 61.

The spelling of 13278556987 in words is "thirteen billion, two hundred seventy-eight million, five hundred fifty-six thousand, nine hundred eighty-seven".