198550955487 has 4 divisors (see below), whose sum is σ = 264734607320. Its totient is φ = 132367303656.

The previous prime is 198550955417. The next prime is 198550955539. The reversal of 198550955487 is 784559055891.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 198550955487 - 2¹⁹ = 198550431199 is a prime.

It is a super-4 number, since 4×198550955487⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198550955417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33091825912 + ... + 33091825917.

It is an arithmetic number, because the mean of its divisors is an integer number (66183651830).

Almost surely, 2^198550955487 is an apocalyptic number.

198550955487 is a deficient number, since it is larger than the sum of its proper divisors (66183651833).

198550955487 is an equidigital number, since it uses as much as digits as its factorization.

198550955487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66183651832.

The product of its (nonzero) digits is 90720000, while the sum is 66.

The spelling of 198550955487 in words is "one hundred ninety-eight billion, five hundred fifty million, nine hundred fifty-five thousand, four hundred eighty-seven".