191878306673 has 2 divisors, whose sum is σ = 191878306674. Its totient is φ = 191878306672.

The previous prime is 191878306649. The next prime is 191878306703. The reversal of 191878306673 is 376603878191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162931707904 + 28946598769 = 403648^2 + 170137^2 .

It is a cyclic number.

It is not a de Polignac number, because 191878306673 - 2¹⁰ = 191878305649 is a prime.

It is not a weakly prime, because it can be changed into another prime (191878306603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95939153336 + 95939153337.

It is an arithmetic number, because the mean of its divisors is an integer number (95939153337).

Almost surely, 2^191878306673 is an apocalyptic number.

It is an amenable number.

191878306673 is a deficient number, since it is larger than the sum of its proper divisors (1).

191878306673 is an equidigital number, since it uses as much as digits as its factorization.

191878306673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 191878306673 in words is "one hundred ninety-one billion, eight hundred seventy-eight million, three hundred six thousand, six hundred seventy-three".