199791305664 has 56 divisors (see below), whose sum is σ = 529132757328. Its totient is φ = 66531809280.

The previous prime is 199791305641. The next prime is 199791305669. The reversal of 199791305664 is 466503197991.

It is a junction number, because it is equal to n+sod(n) for n = 199791305598 and 199791305607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199791305669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313557 + ... + 705620.

It is an arithmetic number, because the mean of its divisors is an integer number (9448799238).

Almost surely, 2^199791305664 is an apocalyptic number.

It is an amenable number.

199791305664 is an abundant number, since it is smaller than the sum of its proper divisors (329341451664).

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

199791305664 is a wasteful number, since it uses less digits than its factorization.

199791305664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020213 (or 1020203 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 60.

The spelling of 199791305664 in words is "one hundred ninety-nine billion, seven hundred ninety-one million, three hundred five thousand, six hundred sixty-four".