323642451661 has 4 divisors (see below), whose sum is σ = 323686235932. Its totient is φ = 323598667392.

The previous prime is 323642451611. The next prime is 323642451679. The reversal of 323642451661 is 166154246323.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 209942658025 + 113699793636 = 458195^2 + 337194^2 .

It is a cyclic number.

It is not a de Polignac number, because 323642451661 - 2⁹ = 323642451149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323642451611) 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, 21881046 + ... + 21895831.

It is an arithmetic number, because the mean of its divisors is an integer number (80921558983).

Almost surely, 2^323642451661 is an apocalyptic number.

It is an amenable number.

323642451661 is a deficient number, since it is larger than the sum of its proper divisors (43784271).

323642451661 is an equidigital number, since it uses as much as digits as its factorization.

323642451661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43784270.

The product of its digits is 622080, while the sum is 43.

Adding to 323642451661 its reverse (166154246323), we get a palindrome (489796697984).

The spelling of 323642451661 in words is "three hundred twenty-three billion, six hundred forty-two million, four hundred fifty-one thousand, six hundred sixty-one".