199999999997 has 16 divisors (see below), whose sum is σ = 233371430400. Its totient is φ = 171329142096.

The previous prime is 199999999949. The next prime is 200000000041. The reversal of 199999999997 is 799999999991.

It is a happy number.

It is not a de Polignac number, because 199999999997 - 2¹⁰ = 199999998973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999999937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426188 + ... + 762650.

It is an arithmetic number, because the mean of its divisors is an integer number (14585714400).

Almost surely, 2^199999999997 is an apocalyptic number.

It is an amenable number.

199999999997 is a deficient number, since it is larger than the sum of its proper divisors (33371430403).

199999999997 is an equidigital number, since it uses as much as digits as its factorization.

199999999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338217 (or 338203 counting only the distinct ones).

The product of its digits is 24407490807, while the sum is 98.

The spelling of 199999999997 in words is "one hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".