163121450465 has 4 divisors (see below), whose sum is σ = 195745740564. Its totient is φ = 130497160368.

The previous prime is 163121450461. The next prime is 163121450477. The reversal of 163121450465 is 564054121361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564054121361 = 19 ⋅29687059019.

It can be written as a sum of positive squares in 2 ways, for example, as 95035941841 + 68085508624 = 308279^2 + 260932^2 .

It is a cyclic number.

It is not a de Polignac number, because 163121450465 - 2² = 163121450461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163121450461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16312145042 + ... + 16312145051.

It is an arithmetic number, because the mean of its divisors is an integer number (48936435141).

Almost surely, 2^163121450465 is an apocalyptic number.

It is an amenable number.

163121450465 is a deficient number, since it is larger than the sum of its proper divisors (32624290099).

163121450465 is an equidigital number, since it uses as much as digits as its factorization.

163121450465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32624290098.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 163121450465 in words is "one hundred sixty-three billion, one hundred twenty-one million, four hundred fifty thousand, four hundred sixty-five".