163503221432513 has 4 divisors (see below), whose sum is σ = 163781761844400. Its totient is φ = 163224681020628.

The previous prime is 163503221432491. The next prime is 163503221432581. The reversal of 163503221432513 is 315234122305361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163503221432513 - 2²² = 163503217238209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163503221431513) 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, 139270205063 + ... + 139270206236.

It is an arithmetic number, because the mean of its divisors is an integer number (40945440461100).

Almost surely, 2^{163503221432513} is an apocalyptic number.

It is an amenable number.

163503221432513 is a deficient number, since it is larger than the sum of its proper divisors (278540411887).

163503221432513 is an equidigital number, since it uses as much as digits as its factorization.

163503221432513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278540411886.

The product of its (nonzero) digits is 388800, while the sum is 41.

Adding to 163503221432513 its reverse (315234122305361), we get a palindrome (478737343737874).

The spelling of 163503221432513 in words is "one hundred sixty-three trillion, five hundred three billion, two hundred twenty-one million, four hundred thirty-two thousand, five hundred thirteen".