198523785587 has 4 divisors (see below), whose sum is σ = 198753825600. Its totient is φ = 198293745576.

The previous prime is 198523785541. The next prime is 198523785617. The reversal of 198523785587 is 785587325891.

198523785587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 198523785587 - 2²⁰ = 198522737011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198523785487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115018712 + ... + 115020437.

It is an arithmetic number, because the mean of its divisors is an integer number (49688456400).

Almost surely, 2^198523785587 is an apocalyptic number.

198523785587 is a deficient number, since it is larger than the sum of its proper divisors (230040013).

198523785587 is an equidigital number, since it uses as much as digits as its factorization.

198523785587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230040012.

The product of its digits is 169344000, while the sum is 68.

The spelling of 198523785587 in words is "one hundred ninety-eight billion, five hundred twenty-three million, seven hundred eighty-five thousand, five hundred eighty-seven".