191661961343 has 2 divisors, whose sum is σ = 191661961344. Its totient is φ = 191661961342.

The previous prime is 191661961339. The next prime is 191661961349. The reversal of 191661961343 is 343169166191.

It is a weak prime.

It is an emirp because it is prime and its reverse (343169166191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191661961343 - 2² = 191661961339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191661961291 and 191661961300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191661961349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95830980671 + 95830980672.

It is an arithmetic number, because the mean of its divisors is an integer number (95830980672).

Almost surely, 2^191661961343 is an apocalyptic number.

191661961343 is a deficient number, since it is larger than the sum of its proper divisors (1).

191661961343 is an equidigital number, since it uses as much as digits as its factorization.

191661961343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 50.

The spelling of 191661961343 in words is "one hundred ninety-one billion, six hundred sixty-one million, nine hundred sixty-one thousand, three hundred forty-three".