199964000000 has 126 divisors (see below), whose sum is σ = 498937207272. Its totient is φ = 79984000000.

The previous prime is 199963999951. The next prime is 199964000009. The reversal of 199964000000 is 469991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199964000009) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 3975005 + ... + 4024995.

Almost surely, 2^199964000000 is an apocalyptic number.

199964000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199964000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249468603636).

199964000000 is an abundant number, since it is smaller than the sum of its proper divisors (298973207272).

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

199964000000 is an frugal number, since it uses more digits than its factorization.

199964000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50037 (or 49998 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

Adding to 199964000000 its reverse (469991), we get a palindrome (199964469991).

The spelling of 199964000000 in words is "one hundred ninety-nine billion, nine hundred sixty-four million", and thus it is an aban number.