83563919905 has 4 divisors (see below), whose sum is σ = 100276703892. Its totient is φ = 66851135920.

The previous prime is 83563919899. The next prime is 83563919909. The reversal of 83563919905 is 50991936538.

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 52859067921 + 30704851984 = 229911^2 + 175228^2 .

It is not a de Polignac number, because 83563919905 - 2²⁵ = 83530365473 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83563919905.

It is not an unprimeable number, because it can be changed into a prime (83563919909) 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 3 ways as a sum of consecutive naturals, for example, 8356391986 + ... + 8356391995.

It is an arithmetic number, because the mean of its divisors is an integer number (25069175973).

Almost surely, 2^83563919905 is an apocalyptic number.

It is an amenable number.

83563919905 is a deficient number, since it is larger than the sum of its proper divisors (16712783987).

83563919905 is a wasteful number, since it uses less digits than its factorization.

83563919905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16712783986.

The product of its (nonzero) digits is 7873200, while the sum is 58.

The spelling of 83563919905 in words is "eighty-three billion, five hundred sixty-three million, nine hundred nineteen thousand, nine hundred five".