198158933491 has 16 divisors (see below), whose sum is σ = 206728720128. Its totient is φ = 189726566400.

The previous prime is 198158933419. The next prime is 198158933537. The reversal of 198158933491 is 194339851891.

It is a cyclic number.

It is not a de Polignac number, because 198158933491 - 2⁷ = 198158933363 is a prime.

It is a super-2 number, since 2×198158933491² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198158933591) 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, 10794981 + ... + 10813321.

It is an arithmetic number, because the mean of its divisors is an integer number (12920545008).

Almost surely, 2^198158933491 is an apocalyptic number.

198158933491 is a deficient number, since it is larger than the sum of its proper divisors (8569786637).

198158933491 is a wasteful number, since it uses less digits than its factorization.

198158933491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22062.

The product of its digits is 8398080, while the sum is 61.

The spelling of 198158933491 in words is "one hundred ninety-eight billion, one hundred fifty-eight million, nine hundred thirty-three thousand, four hundred ninety-one".