198416979491 has 8 divisors (see below), whose sum is σ = 198793573920. Its totient is φ = 198040484032.

The previous prime is 198416979389. The next prime is 198416979511. The reversal of 198416979491 is 194979614891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198416979491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198416979191) 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, 4909121 + ... + 4949373.

It is an arithmetic number, because the mean of its divisors is an integer number (24849196740).

Almost surely, 2^198416979491 is an apocalyptic number.

198416979491 is a deficient number, since it is larger than the sum of its proper divisors (376594429).

198416979491 is an equidigital number, since it uses as much as digits as its factorization.

198416979491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49485.

The product of its digits is 35271936, while the sum is 68.

The spelling of 198416979491 in words is "one hundred ninety-eight billion, four hundred sixteen million, nine hundred seventy-nine thousand, four hundred ninety-one".