199817988122640 has 80 divisors (see below), whose sum is σ = 620273971800000. Its totient is φ = 53212692865536.

The previous prime is 199817988122629. The next prime is 199817988122671. The reversal of 199817988122640 is 46221889718991.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×199817988122640² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563134515 + ... + 563489234.

It is an arithmetic number, because the mean of its divisors is an integer number (7753424647500).

Almost surely, 2^{199817988122640} is an apocalyptic number.

199817988122640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199817988122640 is an abundant number, since it is smaller than the sum of its proper divisors (420455983677360).

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

199817988122640 is a wasteful number, since it uses less digits than its factorization.

199817988122640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126624504 (or 1126624498 counting only the distinct ones).

The product of its (nonzero) digits is 250822656, while the sum is 75.

The spelling of 199817988122640 in words is "one hundred ninety-nine trillion, eight hundred seventeen billion, nine hundred eighty-eight million, one hundred twenty-two thousand, six hundred forty".