199518661632 has 66 divisors (see below), whose sum is σ = 531855969708. Its totient is φ = 66497968128.

The previous prime is 199518661631. The next prime is 199518661673. The reversal of 199518661632 is 236166815991.

It is not an unprimeable number, because it can be changed into a prime (199518661631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24753219 + ... + 24761277.

Almost surely, 2^199518661632 is an apocalyptic number.

199518661632 is a gapful number since it is divisible by the number (12) 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 199518661632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265927984854).

199518661632 is an abundant number, since it is smaller than the sum of its proper divisors (332337308076).

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

199518661632 is an frugal number, since it uses more digits than its factorization.

199518661632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16141 (or 8064 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 57.

The spelling of 199518661632 in words is "one hundred ninety-nine billion, five hundred eighteen million, six hundred sixty-one thousand, six hundred thirty-two".