199821969464 has 64 divisors (see below), whose sum is σ = 409979283840. Its totient is φ = 90750384000.

The previous prime is 199821969443. The next prime is 199821969481. The reversal of 199821969464 is 464969128991.

It is a junction number, because it is equal to n+sod(n) for n = 199821969394 and 199821969403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2120519 + ... + 2212745.

It is an arithmetic number, because the mean of its divisors is an integer number (6405926310).

Almost surely, 2^199821969464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199821969464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204989641920).

199821969464 is an abundant number, since it is smaller than the sum of its proper divisors (210157314376).

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

199821969464 is a wasteful number, since it uses less digits than its factorization.

199821969464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92580 (or 92576 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 68.

The spelling of 199821969464 in words is "one hundred ninety-nine billion, eight hundred twenty-one million, nine hundred sixty-nine thousand, four hundred sixty-four".