199969118365 has 4 divisors (see below), whose sum is σ = 239962942044. Its totient is φ = 159975294688.

The previous prime is 199969118357. The next prime is 199969118381. The reversal of 199969118365 is 563811969991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30774281476 + 169194836889 = 175426^2 + 411333^2 .

It is a cyclic number.

It is not a de Polignac number, because 199969118365 - 2³ = 199969118357 is a prime.

It is a Smith number, since the sum of its digits (67) 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 self number, because there is not a number n which added to its sum of digits gives 199969118365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19996911832 + ... + 19996911841.

It is an arithmetic number, because the mean of its divisors is an integer number (59990735511).

Almost surely, 2^199969118365 is an apocalyptic number.

It is an amenable number.

199969118365 is a deficient number, since it is larger than the sum of its proper divisors (39993823679).

199969118365 is an equidigital number, since it uses as much as digits as its factorization.

199969118365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39993823678.

The product of its digits is 28343520, while the sum is 67.

The spelling of 199969118365 in words is "one hundred ninety-nine billion, nine hundred sixty-nine million, one hundred eighteen thousand, three hundred sixty-five".