842493083561 has 2 divisors, whose sum is σ = 842493083562. Its totient is φ = 842493083560.

The previous prime is 842493083479. The next prime is 842493083563. The reversal of 842493083561 is 165380394248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561571883161 + 280921200400 = 749381^2 + 530020^2 .

It is a cyclic number.

It is not a de Polignac number, because 842493083561 - 2¹⁰ = 842493082537 is a prime.

Together with 842493083563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (842493083563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421246541780 + 421246541781.

It is an arithmetic number, because the mean of its divisors is an integer number (421246541781).

Almost surely, 2^842493083561 is an apocalyptic number.

It is an amenable number.

842493083561 is a deficient number, since it is larger than the sum of its proper divisors (1).

842493083561 is an equidigital number, since it uses as much as digits as its factorization.

842493083561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 842493083561 in words is "eight hundred forty-two billion, four hundred ninety-three million, eighty-three thousand, five hundred sixty-one".