199819273042 has 8 divisors (see below), whose sum is σ = 299730833532. Its totient is φ = 99908995200.

The previous prime is 199819272931. The next prime is 199819273051. The reversal of 199819273042 is 240372918991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 185460283801 + 14358989241 = 430651^2 + 119829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346042 + ... + 720682.

Almost surely, 2^199819273042 is an apocalyptic number.

199819273042 is a deficient number, since it is larger than the sum of its proper divisors (99911560490).

199819273042 is a wasteful number, since it uses less digits than its factorization.

199819273042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641324.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 199819273042 in words is "one hundred ninety-nine billion, eight hundred nineteen million, two hundred seventy-three thousand, forty-two".