13863856505 has 4 divisors (see below), whose sum is σ = 16636627812. Its totient is φ = 11091085200.

The previous prime is 13863856499. The next prime is 13863856577. The reversal of 13863856505 is 50565836831.

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 9402017296 + 4461839209 = 96964^2 + 66797^2 .

It is not a de Polignac number, because 13863856505 - 2⁸ = 13863856249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386385646 + ... + 1386385655.

It is an arithmetic number, because the mean of its divisors is an integer number (4159156953).

Almost surely, 2^13863856505 is an apocalyptic number.

It is an amenable number.

13863856505 is a deficient number, since it is larger than the sum of its proper divisors (2772771307).

13863856505 is an equidigital number, since it uses as much as digits as its factorization.

13863856505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772771306.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 13863856505 in words is "thirteen billion, eight hundred sixty-three million, eight hundred fifty-six thousand, five hundred five".