163617673565 has 8 divisors (see below), whose sum is σ = 201130018488. Its totient is φ = 127701598720.

The previous prime is 163617673537. The next prime is 163617673567. The reversal of 163617673565 is 565376716361.

163617673565 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 4 ways, for example, as 15452727481 + 148164946084 = 124309^2 + 384922^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-163617673565 is a prime.

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 163617673565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163617673567) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 399067292 + ... + 399067701.

It is an arithmetic number, because the mean of its divisors is an integer number (25141252311).

Almost surely, 2^163617673565 is an apocalyptic number.

It is an amenable number.

163617673565 is a deficient number, since it is larger than the sum of its proper divisors (37512344923).

163617673565 is an equidigital number, since it uses as much as digits as its factorization.

163617673565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798135039.

The product of its digits is 14288400, while the sum is 56.

The spelling of 163617673565 in words is "one hundred sixty-three billion, six hundred seventeen million, six hundred seventy-three thousand, five hundred sixty-five".