199987788873 has 16 divisors (see below), whose sum is σ = 275000016896. Its totient is φ = 129199205520.

The previous prime is 199987788853. The next prime is 199987788883. The reversal of 199987788873 is 378887789991.

It is a happy number.

It is not a de Polignac number, because 199987788873 - 2⁸ = 199987788617 is a prime.

It is a super-2 number, since 2×199987788873² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199987788853) 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, 6087133 + ... + 6119898.

It is an arithmetic number, because the mean of its divisors is an integer number (17187501056).

Almost surely, 2^199987788873 is an apocalyptic number.

It is an amenable number.

199987788873 is a deficient number, since it is larger than the sum of its proper divisors (75012228023).

199987788873 is a wasteful number, since it uses less digits than its factorization.

199987788873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12207204.

The product of its digits is 3072577536, while the sum is 84.

The spelling of 199987788873 in words is "one hundred ninety-nine billion, nine hundred eighty-seven million, seven hundred eighty-eight thousand, eight hundred seventy-three".