199454945078 has 32 divisors (see below), whose sum is σ = 312283762560. Its totient is φ = 95460480000.

The previous prime is 199454945077. The next prime is 199454945087. The reversal of 199454945078 is 870549454991.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199454945071) 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, 1956083 + ... + 2055521.

It is an arithmetic number, because the mean of its divisors is an integer number (9758867580).

Almost surely, 2^199454945078 is an apocalyptic number.

199454945078 is a deficient number, since it is larger than the sum of its proper divisors (112828817482).

199454945078 is a wasteful number, since it uses less digits than its factorization.

199454945078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99944.

The product of its (nonzero) digits is 65318400, while the sum is 65.

The spelling of 199454945078 in words is "one hundred ninety-nine billion, four hundred fifty-four million, nine hundred forty-five thousand, seventy-eight".