68644011691 has 2 divisors, whose sum is σ = 68644011692. Its totient is φ = 68644011690.

The previous prime is 68644011673. The next prime is 68644011703. The reversal of 68644011691 is 19611044686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68644011691 - 2⁷ = 68644011563 is a prime.

It is not a weakly prime, because it can be changed into another prime (68644015691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34322005845 + 34322005846.

It is an arithmetic number, because the mean of its divisors is an integer number (34322005846).

Almost surely, 2^68644011691 is an apocalyptic number.

68644011691 is a deficient number, since it is larger than the sum of its proper divisors (1).

68644011691 is an equidigital number, since it uses as much as digits as its factorization.

68644011691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 68644011691 in words is "sixty-eight billion, six hundred forty-four million, eleven thousand, six hundred ninety-one".