199551425668 has 24 divisors (see below), whose sum is σ = 400024591232. Its totient is φ = 85324523904.

The previous prime is 199551425659. The next prime is 199551425681. The reversal of 199551425668 is 866524155991.

It is a super-2 number, since 2×199551425668² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8217480 + ... + 8241727.

Almost surely, 2^199551425668 is an apocalyptic number.

It is an amenable number.

199551425668 is an abundant number, since it is smaller than the sum of its proper divisors (200473165564).

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

199551425668 is a wasteful number, since it uses less digits than its factorization.

199551425668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16459651 (or 16459649 counting only the distinct ones).

The product of its digits is 23328000, while the sum is 61.

The spelling of 199551425668 in words is "one hundred ninety-nine billion, five hundred fifty-one million, four hundred twenty-five thousand, six hundred sixty-eight".