191680342247689 has 3 divisors (see below), whose sum is σ = 191680356092557. Its totient is φ = 191680328402822.

The previous prime is 191680342247677. The next prime is 191680342247753. The reversal of 191680342247689 is 986742243086191.

The square root of 191680342247689 is 13844867.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 191680342247689 - 2¹¹ = 191680342245641 is a prime.

It is a super-3 number, since 3×191680342247689³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191680342247629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6922434 + ... + 20767300.

Almost surely, 2^{191680342247689} is an apocalyptic number.

191680342247689 is the 13844867-th square number.

191680342247689 is the 6922434-th centered octagonal number.

It is an amenable number.

191680342247689 is a deficient number, since it is larger than the sum of its proper divisors (13844868).

191680342247689 is an frugal number, since it uses more digits than its factorization.

191680342247689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27689734 (or 13844867 counting only the distinct ones).

The product of its (nonzero) digits is 250822656, while the sum is 70.

The spelling of 191680342247689 in words is "one hundred ninety-one trillion, six hundred eighty billion, three hundred forty-two million, two hundred forty-seven thousand, six hundred eighty-nine".