1663223665123 has 4 divisors (see below), whose sum is σ = 1663232717088. Its totient is φ = 1663214613160.

The previous prime is 1663223665097. The next prime is 1663223665127. The reversal of 1663223665123 is 3215663223661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1663223665123 - 2²¹ = 1663221567971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663223665127) 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, 4244536 + ... + 4619797.

It is an arithmetic number, because the mean of its divisors is an integer number (415808179272).

Almost surely, 2^{1663223665123} is an apocalyptic number.

1663223665123 is a deficient number, since it is larger than the sum of its proper divisors (9051965).

1663223665123 is an equidigital number, since it uses as much as digits as its factorization.

1663223665123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9051964.

The product of its digits is 1399680, while the sum is 46.

Adding to 1663223665123 its reverse (3215663223661), we get a palindrome (4878886888784).

The spelling of 1663223665123 in words is "one trillion, six hundred sixty-three billion, two hundred twenty-three million, six hundred sixty-five thousand, one hundred twenty-three".