191708426017 has 4 divisors (see below), whose sum is σ = 191904648516. Its totient is φ = 191512203520.

The previous prime is 191708426003. The next prime is 191708426047. The reversal of 191708426017 is 710624807191.

It is a happy number.

191708426017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149193697536 + 42514728481 = 386256^2 + 206191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191708426017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191708426047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98109784 + ... + 98111737.

It is an arithmetic number, because the mean of its divisors is an integer number (47976162129).

Almost surely, 2^191708426017 is an apocalyptic number.

It is an amenable number.

191708426017 is a deficient number, since it is larger than the sum of its proper divisors (196222499).

191708426017 is an equidigital number, since it uses as much as digits as its factorization.

191708426017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196222498.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 191708426017 in words is "one hundred ninety-one billion, seven hundred eight million, four hundred twenty-six thousand, seventeen".