191918108159 has 8 divisors (see below), whose sum is σ = 203076756480. Its totient is φ = 180865229400.

The previous prime is 191918108101. The next prime is 191918108191. The reversal of 191918108159 is 951801819191.

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

It is a de Polignac number, because none of the positive numbers 2^k-191918108159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191918108159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191918104159) 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, 26438657 + ... + 26445914.

It is an arithmetic number, because the mean of its divisors is an integer number (25384594560).

Almost surely, 2^191918108159 is an apocalyptic number.

191918108159 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

191918108159 is a deficient number, since it is larger than the sum of its proper divisors (11158648321).

191918108159 is a wasteful number, since it uses less digits than its factorization.

191918108159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52884781.

The product of its (nonzero) digits is 233280, while the sum is 53.

The spelling of 191918108159 in words is "one hundred ninety-one billion, nine hundred eighteen million, one hundred eight thousand, one hundred fifty-nine".