191664414199 has 4 divisors (see below), whose sum is σ = 198273531960. Its totient is φ = 185055296440.

The previous prime is 191664414157. The next prime is 191664414217. The reversal of 191664414199 is 991414466191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991414466191 = 137 ⋅7236601943.

It is a cyclic number.

It is not a de Polignac number, because 191664414199 - 2¹¹ = 191664412151 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 (191664415199) 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, 3304558837 + ... + 3304558894.

It is an arithmetic number, because the mean of its divisors is an integer number (49568382990).

Almost surely, 2^191664414199 is an apocalyptic number.

191664414199 is a deficient number, since it is larger than the sum of its proper divisors (6609117761).

191664414199 is an equidigital number, since it uses as much as digits as its factorization.

191664414199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6609117760.

The product of its digits is 1679616, while the sum is 55.

The spelling of 191664414199 in words is "one hundred ninety-one billion, six hundred sixty-four million, four hundred fourteen thousand, one hundred ninety-nine".