199208664505 has 8 divisors (see below), whose sum is σ = 239068137672. Its totient is φ = 159355104768.

The previous prime is 199208664503. The next prime is 199208664521. The reversal of 199208664505 is 505466802991.

It can be written as a sum of positive squares in 4 ways, for example, as 89740986624 + 109467677881 = 299568^2 + 330859^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199208664505 - 2¹ = 199208664503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199208664503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1403902 + ... + 1539271.

It is an arithmetic number, because the mean of its divisors is an integer number (29883517209).

Almost surely, 2^199208664505 is an apocalyptic number.

It is an amenable number.

199208664505 is a deficient number, since it is larger than the sum of its proper divisors (39859473167).

199208664505 is a wasteful number, since it uses less digits than its factorization.

199208664505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956715.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 199208664505 in words is "one hundred ninety-nine billion, two hundred eight million, six hundred sixty-four thousand, five hundred five".