13543961805 has 80 divisors (see below), whose sum is σ = 27880142400. Its totient is φ = 6221111040.

The previous prime is 13543961803. The next prime is 13543961819. The reversal of 13543961805 is 50816934531.

13543961805 is a `hidden beast` number, since 1 + 3 + 543 + 96 + 18 + 0 + 5 = 666.

13543961805 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 13543961805 - 2¹ = 13543961803 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13543961803) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 4641 + ... + 164649.

It is an arithmetic number, because the mean of its divisors is an integer number (348501780).

Almost surely, 2^13543961805 is an apocalyptic number.

13543961805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13543961805 is an abundant number, since it is smaller than the sum of its proper divisors (14336180595).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13543961805 is a wasteful number, since it uses less digits than its factorization.

13543961805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160056 (or 160047 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 13543961805 in words is "thirteen billion, five hundred forty-three million, nine hundred sixty-one thousand, eight hundred five".