183968661217 has 4 divisors (see below), whose sum is σ = 200693084976. Its totient is φ = 167244237460.

The previous prime is 183968661209. The next prime is 183968661251. The reversal of 183968661217 is 712166869381.

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 183968661217 - 2³ = 183968661209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (183968661017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8362211863 + ... + 8362211884.

It is an arithmetic number, because the mean of its divisors is an integer number (50173271244).

Almost surely, 2^183968661217 is an apocalyptic number.

It is an amenable number.

183968661217 is a deficient number, since it is larger than the sum of its proper divisors (16724423759).

183968661217 is a wasteful number, since it uses less digits than its factorization.

183968661217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16724423758.

The product of its digits is 5225472, while the sum is 58.

The spelling of 183968661217 in words is "one hundred eighty-three billion, nine hundred sixty-eight million, six hundred sixty-one thousand, two hundred seventeen".