223161312661 has 4 divisors (see below), whose sum is σ = 255041500192. Its totient is φ = 191281125132.

The previous prime is 223161312643. The next prime is 223161312743. The reversal of 223161312661 is 166213161322.

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 223161312661 - 2⁷ = 223161312533 is a prime.

It is a super-3 number, since 3×223161312661³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223167312661) 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, 15940093755 + ... + 15940093768.

It is an arithmetic number, because the mean of its divisors is an integer number (63760375048).

Almost surely, 2^223161312661 is an apocalyptic number.

It is an amenable number.

223161312661 is a deficient number, since it is larger than the sum of its proper divisors (31880187531).

223161312661 is an equidigital number, since it uses as much as digits as its factorization.

223161312661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31880187530.

The product of its digits is 15552, while the sum is 34.

Adding to 223161312661 its reverse (166213161322), we get a palindrome (389374473983).

The spelling of 223161312661 in words is "two hundred twenty-three billion, one hundred sixty-one million, three hundred twelve thousand, six hundred sixty-one".