13239720855 has 24 divisors (see below), whose sum is σ = 23482547088. Its totient is φ = 6896969856.

The previous prime is 13239720827. The next prime is 13239720869. The reversal of 13239720855 is 55802793231.

13239720855 is a `hidden beast` number, since 1 + 3 + 2 + 397 + 208 + 55 = 666.

13239720855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13239720855 - 2⁷ = 13239720727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 13239720855.

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 23 ways as a sum of consecutive naturals, for example, 3419182 + ... + 3423051.

It is an arithmetic number, because the mean of its divisors is an integer number (978439462).

Almost surely, 2^13239720855 is an apocalyptic number.

13239720855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13239720855 is a deficient number, since it is larger than the sum of its proper divisors (10242826233).

13239720855 is a wasteful number, since it uses less digits than its factorization.

13239720855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842287 (or 6842284 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 13239720855 in words is "thirteen billion, two hundred thirty-nine million, seven hundred twenty thousand, eight hundred fifty-five".