199811946990 has 32 divisors (see below), whose sum is σ = 479698342560. Its totient is φ = 53266555904.

The previous prime is 199811946941. The next prime is 199811946991. The reversal of 199811946990 is 99649118991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199811946991) 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, 941499 + ... + 1134038.

It is an arithmetic number, because the mean of its divisors is an integer number (14990573205).

Almost surely, 2^199811946990 is an apocalyptic number.

199811946990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199811946990 is an abundant number, since it is smaller than the sum of its proper divisors (279886395570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199811946990 is a wasteful number, since it uses less digits than its factorization.

199811946990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078756.

The product of its (nonzero) digits is 11337408, while the sum is 66.

The spelling of 199811946990 in words is "one hundred ninety-nine billion, eight hundred eleven million, nine hundred forty-six thousand, nine hundred ninety".