199660464388123 has 2 divisors, whose sum is σ = 199660464388124. Its totient is φ = 199660464388122.

The previous prime is 199660464388103. The next prime is 199660464388153. The reversal of 199660464388123 is 321883464066991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199660464388123 - 2³⁷ = 199523025434651 is a prime.

It is not a weakly prime, because it can be changed into another prime (199660464388103) 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 as a sum of consecutive naturals, namely, 99830232194061 + 99830232194062.

It is an arithmetic number, because the mean of its divisors is an integer number (99830232194062).

Almost surely, 2^{199660464388123} is an apocalyptic number.

199660464388123 is a deficient number, since it is larger than the sum of its proper divisors (1).

199660464388123 is an equidigital number, since it uses as much as digits as its factorization.

199660464388123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322486272, while the sum is 70.

The spelling of 199660464388123 in words is "one hundred ninety-nine trillion, six hundred sixty billion, four hundred sixty-four million, three hundred eighty-eight thousand, one hundred twenty-three".