13980355805 has 16 divisors (see below), whose sum is σ = 18232682160. Its totient is φ = 10229234688.

The previous prime is 13980355793. The next prime is 13980355843. The reversal of 13980355805 is 50855308931.

13980355805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3426697444 + 10553658361 = 58538^2 + 102731^2 .

It is a cyclic number.

It is not a de Polignac number, because 13980355805 - 2¹⁸ = 13980093661 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 13980355805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 979532 + ... + 993701.

It is an arithmetic number, because the mean of its divisors is an integer number (1139542635).

Almost surely, 2^13980355805 is an apocalyptic number.

It is an amenable number.

13980355805 is a deficient number, since it is larger than the sum of its proper divisors (4252326355).

13980355805 is a wasteful number, since it uses less digits than its factorization.

13980355805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973360.

The product of its (nonzero) digits is 648000, while the sum is 47.

The spelling of 13980355805 in words is "thirteen billion, nine hundred eighty million, three hundred fifty-five thousand, eight hundred five".