1968646619 has 2 divisors, whose sum is σ = 1968646620. Its totient is φ = 1968646618.

The previous prime is 1968646609. The next prime is 1968646621. The reversal of 1968646619 is 9166468691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1968646619 is a prime.

It is a super-2 number, since 2×1968646619² = 7751139021000262322, which contains 22 as substring.

Together with 1968646621, 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 (1968646609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984323309 + 984323310.

It is an arithmetic number, because the mean of its divisors is an integer number (984323310).

Almost surely, 2^1968646619 is an apocalyptic number.

1968646619 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968646619 is an equidigital number, since it uses as much as digits as its factorization.

1968646619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 56.

The square root of 1968646619 is about 44369.4333860598. The cubic root of 1968646619 is about 1253.3025455898.

The spelling of 1968646619 in words is "one billion, nine hundred sixty-eight million, six hundred forty-six thousand, six hundred nineteen".