199668613247 has 4 divisors (see below), whose sum is σ = 200990922096. Its totient is φ = 198346304400.

The previous prime is 199668613223. The next prime is 199668613253. The reversal of 199668613247 is 742316866991.

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 199668613247 - 2⁸ = 199668612991 is a prime.

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 199668613247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199668613297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661154198 + ... + 661154499.

It is an arithmetic number, because the mean of its divisors is an integer number (50247730524).

Almost surely, 2^199668613247 is an apocalyptic number.

199668613247 is a deficient number, since it is larger than the sum of its proper divisors (1322308849).

199668613247 is a wasteful number, since it uses less digits than its factorization.

199668613247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322308848.

The product of its digits is 23514624, while the sum is 62.

The spelling of 199668613247 in words is "one hundred ninety-nine billion, six hundred sixty-eight million, six hundred thirteen thousand, two hundred forty-seven".