163120908505 has 4 divisors (see below), whose sum is σ = 195745090212. Its totient is φ = 130496726800.

The previous prime is 163120908491. The next prime is 163120908557. The reversal of 163120908505 is 505809021361.

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 107683735104 + 55437173401 = 328152^2 + 235451^2 .

It is not a de Polignac number, because 163120908505 - 2¹¹ = 163120906457 is a prime.

It is a Smith number, since the sum of its digits (40) 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16312090846 + ... + 16312090855.

It is an arithmetic number, because the mean of its divisors is an integer number (48936272553).

Almost surely, 2^163120908505 is an apocalyptic number.

It is an amenable number.

163120908505 is a deficient number, since it is larger than the sum of its proper divisors (32624181707).

163120908505 is an equidigital number, since it uses as much as digits as its factorization.

163120908505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32624181706.

The product of its (nonzero) digits is 64800, while the sum is 40.

Adding to 163120908505 its reverse (505809021361), we get a palindrome (668929929866).

The spelling of 163120908505 in words is "one hundred sixty-three billion, one hundred twenty million, nine hundred eight thousand, five hundred five".