198151692817 has 8 divisors (see below), whose sum is σ = 214826308200. Its totient is φ = 181681674240.

The previous prime is 198151692811. The next prime is 198151692847. The reversal of 198151692817 is 718296151891.

It can be written as a sum of positive squares in 4 ways, for example, as 12445856721 + 185705836096 = 111561^2 + 430936^2 .

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 198151692817 - 2⁷ = 198151692689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198151692811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51147184 + ... + 51151057.

It is an arithmetic number, because the mean of its divisors is an integer number (26853288525).

Almost surely, 2^198151692817 is an apocalyptic number.

It is an amenable number.

198151692817 is a deficient number, since it is larger than the sum of its proper divisors (16674615383).

198151692817 is a wasteful number, since it uses less digits than its factorization.

198151692817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102298403.

The product of its digits is 2177280, while the sum is 58.

The spelling of 198151692817 in words is "one hundred ninety-eight billion, one hundred fifty-one million, six hundred ninety-two thousand, eight hundred seventeen".