199968019656 has 32 divisors (see below), whose sum is σ = 500834012640. Its totient is φ = 66534144768.

The previous prime is 199968019621. The next prime is 199968019673. The reversal of 199968019656 is 656910869991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7602961 + ... + 7629216.

It is an arithmetic number, because the mean of its divisors is an integer number (15651062895).

Almost surely, 2^199968019656 is an apocalyptic number.

It is an amenable number.

199968019656 is an abundant number, since it is smaller than the sum of its proper divisors (300865992984).

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

199968019656 is a wasteful number, since it uses less digits than its factorization.

199968019656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15232733 (or 15232729 counting only the distinct ones).

The product of its (nonzero) digits is 56687040, while the sum is 69.

The spelling of 199968019656 in words is "one hundred ninety-nine billion, nine hundred sixty-eight million, nineteen thousand, six hundred fifty-six".