999818193613 has 2 divisors, whose sum is σ = 999818193614. Its totient is φ = 999818193612.

The previous prime is 999818193611. The next prime is 999818193637. The reversal of 999818193613 is 316391818999.

999818193613 = 707042² + 707043².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499909803849 + 499908389764 = 707043^2 + 707042^2 .

It is a cyclic number.

It is not a de Polignac number, because 999818193613 - 2¹ = 999818193611 is a prime.

Together with 999818193611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999818193611) 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, 499909096806 + 499909096807.

It is an arithmetic number, because the mean of its divisors is an integer number (499909096807).

Almost surely, 2^999818193613 is an apocalyptic number.

999818193613 is the 707043-rd centered square number.

It is an amenable number.

999818193613 is a deficient number, since it is larger than the sum of its proper divisors (1).

999818193613 is an equidigital number, since it uses as much as digits as its factorization.

999818193613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22674816, while the sum is 67.

The spelling of 999818193613 in words is "nine hundred ninety-nine billion, eight hundred eighteen million, one hundred ninety-three thousand, six hundred thirteen".