12780518687 has 4 divisors (see below), whose sum is σ = 12783679200. Its totient is φ = 12777358176.

The previous prime is 12780518683. The next prime is 12780518711. The reversal of 12780518687 is 78681508721.

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 12780518687 - 2² = 12780518683 is a prime.

It is a super-3 number, since 3×12780518687³ (a number of 31 digits) contains 333 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 (12780518683) 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, 1574183 + ... + 1582280.

It is an arithmetic number, because the mean of its divisors is an integer number (3195919800).

Almost surely, 2^12780518687 is an apocalyptic number.

12780518687 is a deficient number, since it is larger than the sum of its proper divisors (3160513).

12780518687 is an equidigital number, since it uses as much as digits as its factorization.

12780518687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160512.

The product of its (nonzero) digits is 1505280, while the sum is 53.

The spelling of 12780518687 in words is "twelve billion, seven hundred eighty million, five hundred eighteen thousand, six hundred eighty-seven".