189918911017 has 12 divisors (see below), whose sum is σ = 214395845188. Its totient is φ = 167987239200.

The previous prime is 189918910997. The next prime is 189918911029. The reversal of 189918911017 is 710119819981.

It can be written as a sum of positive squares in 2 ways, for example, as 143511411241 + 46407499776 = 378829^2 + 215424^2 .

It is not a de Polignac number, because 189918911017 - 2⁷ = 189918910889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189948911017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21206034 + ... + 21214987.

Almost surely, 2^189918911017 is an apocalyptic number.

It is an amenable number.

189918911017 is a deficient number, since it is larger than the sum of its proper divisors (24476934171).

189918911017 is a wasteful number, since it uses less digits than its factorization.

189918911017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42421080 (or 42421069 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 55.

The spelling of 189918911017 in words is "one hundred eighty-nine billion, nine hundred eighteen million, nine hundred eleven thousand, seventeen".