1968066161 has 2 divisors, whose sum is σ = 1968066162. Its totient is φ = 1968066160.

The previous prime is 1968066143. The next prime is 1968066169. The reversal of 1968066161 is 1616608691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1928878561 + 39187600 = 43919^2 + 6260^2 .

It is an emirp because it is prime and its reverse (1616608691) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1919908961 and 1698099191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1968066161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1968066169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984033080 + 984033081.

It is an arithmetic number, because the mean of its divisors is an integer number (984033081).

Almost surely, 2^1968066161 is an apocalyptic number.

It is an amenable number.

1968066161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968066161 is an equidigital number, since it uses as much as digits as its factorization.

1968066161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1968066161 is about 44362.8917114293. The cubic root of 1968066161 is about 1253.1793541895.

The spelling of 1968066161 in words is "one billion, nine hundred sixty-eight million, sixty-six thousand, one hundred sixty-one".