23666665216443 has 4 divisors (see below), whose sum is σ = 31555553621928. Its totient is φ = 15777776810960.

The previous prime is 23666665216417. The next prime is 23666665216451. The reversal of 23666665216443 is 34461256666632.

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 23666665216443 - 2¹² = 23666665212347 is a prime.

It is a super-2 number, since 2×23666665216443² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23666665214443) 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, 3944444202738 + ... + 3944444202743.

It is an arithmetic number, because the mean of its divisors is an integer number (7888888405482).

Almost surely, 2^{23666665216443} is an apocalyptic number.

23666665216443 is a deficient number, since it is larger than the sum of its proper divisors (7888888405485).

23666665216443 is an equidigital number, since it uses as much as digits as its factorization.

23666665216443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7888888405484.

The product of its digits is 134369280, while the sum is 60.

The spelling of 23666665216443 in words is "twenty-three trillion, six hundred sixty-six billion, six hundred sixty-five million, two hundred sixteen thousand, four hundred forty-three".