199897797621912 has 128 divisors (see below), whose sum is σ = 554947358112000. Its totient is φ = 59619438208512.

The previous prime is 199897797621793. The next prime is 199897797621941. The reversal of 199897797621912 is 219126797798991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71450662 + ... + 74195637.

It is an arithmetic number, because the mean of its divisors is an integer number (4335526235250).

Almost surely, 2^{199897797621912} is an apocalyptic number.

199897797621912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

199897797621912 is an abundant number, since it is smaller than the sum of its proper divisors (355049560490088).

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

199897797621912 is a wasteful number, since it uses less digits than its factorization.

199897797621912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145646457 (or 145646453 counting only the distinct ones).

The product of its digits is 3888730944, while the sum is 87.

The spelling of 199897797621912 in words is "one hundred ninety-nine trillion, eight hundred ninety-seven billion, seven hundred ninety-seven million, six hundred twenty-one thousand, nine hundred twelve".