321663311673 has 32 divisors (see below), whose sum is σ = 471193614720. Its totient is φ = 193567203840.

The previous prime is 321663311663. The next prime is 321663311681. The reversal of 321663311673 is 376113366123.

It is not a de Polignac number, because 321663311673 - 2²⁴ = 321646534457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321663311603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4376613 + ... + 4449501.

It is an arithmetic number, because the mean of its divisors is an integer number (14724800460).

Almost surely, 2^321663311673 is an apocalyptic number.

321663311673 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

321663311673 is a deficient number, since it is larger than the sum of its proper divisors (149530303047).

321663311673 is a wasteful number, since it uses less digits than its factorization.

321663311673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73849.

The product of its digits is 244944, while the sum is 42.

Adding to 321663311673 its reverse (376113366123), we get a palindrome (697776677796).

It can be divided in two parts, 321663 and 311673, that added together give a palindrome (633336).

The spelling of 321663311673 in words is "three hundred twenty-one billion, six hundred sixty-three million, three hundred eleven thousand, six hundred seventy-three".