198606618123 has 16 divisors (see below), whose sum is σ = 272251410816. Its totient is φ = 128712306240.

The previous prime is 198606618121. The next prime is 198606618187. The reversal of 198606618123 is 321816606891.

It is not a de Polignac number, because 198606618123 - 2¹ = 198606618121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198606618121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3621090 + ... + 3675527.

It is an arithmetic number, because the mean of its divisors is an integer number (17015713176).

Almost surely, 2^198606618123 is an apocalyptic number.

198606618123 is a deficient number, since it is larger than the sum of its proper divisors (73644792693).

198606618123 is a wasteful number, since it uses less digits than its factorization.

198606618123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296874.

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 198606618123 in words is "one hundred ninety-eight billion, six hundred six million, six hundred eighteen thousand, one hundred twenty-three".