199565905984 has 63 divisors (see below), whose sum is σ = 418095663807. Its totient is φ = 94499054208.

The previous prime is 199565905967. The next prime is 199565906017. The reversal of 199565905984 is 489509565991.

The square root of 199565905984 is 446728.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 67901187 + ... + 67904125.

Almost surely, 2^199565905984 is an apocalyptic number.

199565905984 is the 446728-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199565905984

199565905984 is an abundant number, since it is smaller than the sum of its proper divisors (218529757823).

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

199565905984 is an frugal number, since it uses more digits than its factorization.

199565905984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5928 (or 2960 counting only the distinct ones).

The product of its (nonzero) digits is 157464000, while the sum is 70.

The spelling of 199565905984 in words is "one hundred ninety-nine billion, five hundred sixty-five million, nine hundred five thousand, nine hundred eighty-four".