67681779719 has 2 divisors, whose sum is σ = 67681779720. Its totient is φ = 67681779718.

The previous prime is 67681779643. The next prime is 67681779743. The reversal of 67681779719 is 91797718676.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67681779719 - 2⁸ = 67681779463 is a prime.

It is a super-2 number, since 2×67681779719² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67681979719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33840889859 + 33840889860.

It is an arithmetic number, because the mean of its divisors is an integer number (33840889860).

Almost surely, 2^67681779719 is an apocalyptic number.

67681779719 is a deficient number, since it is larger than the sum of its proper divisors (1).

67681779719 is an equidigital number, since it uses as much as digits as its factorization.

67681779719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56010528, while the sum is 68.

The spelling of 67681779719 in words is "sixty-seven billion, six hundred eighty-one million, seven hundred seventy-nine thousand, seven hundred nineteen".