198379985376091 has 2 divisors, whose sum is σ = 198379985376092. Its totient is φ = 198379985376090.

The previous prime is 198379985376029. The next prime is 198379985376173. The reversal of 198379985376091 is 190673589973891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198379985376091 - 2²³ = 198379976987483 is a prime.

It is not a weakly prime, because it can be changed into another prime (198379985376791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99189992688045 + 99189992688046.

It is an arithmetic number, because the mean of its divisors is an integer number (99189992688046).

Almost surely, 2^{198379985376091} is an apocalyptic number.

198379985376091 is a deficient number, since it is larger than the sum of its proper divisors (1).

198379985376091 is an equidigital number, since it uses as much as digits as its factorization.

198379985376091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5555329920, while the sum is 85.

The spelling of 198379985376091 in words is "one hundred ninety-eight trillion, three hundred seventy-nine billion, nine hundred eighty-five million, three hundred seventy-six thousand, ninety-one".