199065881 has 16 divisors (see below), whose sum is σ = 232790400. Its totient is φ = 170155440.

The previous prime is 199065871. The next prime is 199065887. The reversal of 199065881 is 188560991.

199065881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-199065881 is a prime.

It is a super-2 number, since 2×199065881² = 79254449956612322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199065887) 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, 187091 + ... + 188151.

It is an arithmetic number, because the mean of its divisors is an integer number (14549400).

Almost surely, 2^199065881 is an apocalyptic number.

It is an amenable number.

199065881 is a deficient number, since it is larger than the sum of its proper divisors (33724519).

199065881 is an equidigital number, since it uses as much as digits as its factorization.

199065881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 199065881 is about 14109.0708765673. The cubic root of 199065881 is about 583.8916663143.

The spelling of 199065881 in words is "one hundred ninety-nine million, sixty-five thousand, eight hundred eighty-one".