199961903290 has 16 divisors (see below), whose sum is σ = 359970625800. Its totient is φ = 79976050240.

The previous prime is 199961903263. The next prime is 199961903291. The reversal of 199961903290 is 92309169991.

It can be written as a sum of positive squares in 4 ways, for example, as 199961903241 + 49 = 447171^2 + 7^2 .

It is not an unprimeable number, because it can be changed into a prime (199961903291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992065 + ... + 1176484.

Almost surely, 2^199961903290 is an apocalyptic number.

199961903290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199961903290 is a deficient number, since it is larger than the sum of its proper divisors (160008722510).

199961903290 is a wasteful number, since it uses less digits than its factorization.

199961903290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177777.

The product of its (nonzero) digits is 2125764, while the sum is 58.

The spelling of 199961903290 in words is "one hundred ninety-nine billion, nine hundred sixty-one million, nine hundred three thousand, two hundred ninety".