199745668249 has 8 divisors (see below), whose sum is σ = 201268477440. Its totient is φ = 198227828400.

The previous prime is 199745668223. The next prime is 199745668261. The reversal of 199745668249 is 942866547991.

It is a happy number.

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 199745668249 - 2⁵ = 199745668217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199745668219) 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, 1161619 + ... + 1322440.

It is an arithmetic number, because the mean of its divisors is an integer number (25158559680).

Almost surely, 2^199745668249 is an apocalyptic number.

It is an amenable number.

199745668249 is a deficient number, since it is larger than the sum of its proper divisors (1522809191).

199745668249 is a wasteful number, since it uses less digits than its factorization.

199745668249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484671.

The product of its digits is 235146240, while the sum is 70.

The spelling of 199745668249 in words is "one hundred ninety-nine billion, seven hundred forty-five million, six hundred sixty-eight thousand, two hundred forty-nine".