163221231523 has 4 divisors (see below), whose sum is σ = 186538550320. Its totient is φ = 139903912728.

The previous prime is 163221231449. The next prime is 163221231533. The reversal of 163221231523 is 325132122361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325132122361 = 38783 ⋅8383367.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163221231523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163221231533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11658659388 + ... + 11658659401.

It is an arithmetic number, because the mean of its divisors is an integer number (46634637580).

Almost surely, 2^163221231523 is an apocalyptic number.

163221231523 is a deficient number, since it is larger than the sum of its proper divisors (23317318797).

163221231523 is an equidigital number, since it uses as much as digits as its factorization.

163221231523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23317318796.

The product of its digits is 12960, while the sum is 31.

Adding to 163221231523 its reverse (325132122361), we get a palindrome (488353353884).

The spelling of 163221231523 in words is "one hundred sixty-three billion, two hundred twenty-one million, two hundred thirty-one thousand, five hundred twenty-three".