198821097499 has 8 divisors (see below), whose sum is σ = 203067671040. Its totient is φ = 194575204776.

The previous prime is 198821097481. The next prime is 198821097533. The reversal of 198821097499 is 994790128891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198821097499 - 2¹³ = 198821089307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198821097439) by changing a digit.

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, 443472 + ... + 770914.

It is an arithmetic number, because the mean of its divisors is an integer number (25383458880).

Almost surely, 2^198821097499 is an apocalyptic number.

198821097499 is a deficient number, since it is larger than the sum of its proper divisors (4246573541).

198821097499 is a wasteful number, since it uses less digits than its factorization.

198821097499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340409.

The product of its (nonzero) digits is 23514624, while the sum is 67.

The spelling of 198821097499 in words is "one hundred ninety-eight billion, eight hundred twenty-one million, ninety-seven thousand, four hundred ninety-nine".