68679691 has 2 divisors, whose sum is σ = 68679692. Its totient is φ = 68679690.

The previous prime is 68679673. The next prime is 68679703. The reversal of 68679691 is 19697686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68679691 - 2¹⁵ = 68646923 is a prime.

It is not a weakly prime, because it can be changed into another prime (68674691) 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, 34339845 + 34339846.

It is an arithmetic number, because the mean of its divisors is an integer number (34339846).

Almost surely, 2^68679691 is an apocalyptic number.

68679691 is a deficient number, since it is larger than the sum of its proper divisors (1).

68679691 is an equidigital number, since it uses as much as digits as its factorization.

68679691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 68679691 is about 8287.3210991249. The cubic root of 68679691 is about 409.5209375847.

The spelling of 68679691 in words is "sixty-eight million, six hundred seventy-nine thousand, six hundred ninety-one".