199064460991 has 4 divisors (see below), whose sum is σ = 217161230184. Its totient is φ = 180967691800.

The previous prime is 199064460989. The next prime is 199064461021.

199064460991 is nontrivially palindromic in base 10.

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 199064460991 - 2¹ = 199064460989 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199064460901) 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, 9048384580 + ... + 9048384601.

It is an arithmetic number, because the mean of its divisors is an integer number (54290307546).

Almost surely, 2^199064460991 is an apocalyptic number.

199064460991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

199064460991 is a deficient number, since it is larger than the sum of its proper divisors (18096769193).

199064460991 is a wasteful number, since it uses less digits than its factorization.

199064460991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18096769192.

The product of its (nonzero) digits is 3779136, while the sum is 58.

The spelling of 199064460991 in words is "one hundred ninety-nine billion, sixty-four million, four hundred sixty thousand, nine hundred ninety-one".