68724046891 has 2 divisors, whose sum is σ = 68724046892. Its totient is φ = 68724046890.

The previous prime is 68724046879. The next prime is 68724046921. The reversal of 68724046891 is 19864042786.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68724046891 - 2⁷ = 68724046763 is a prime.

It is not a weakly prime, because it can be changed into another prime (68724046871) 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, 34362023445 + 34362023446.

It is an arithmetic number, because the mean of its divisors is an integer number (34362023446).

Almost surely, 2^68724046891 is an apocalyptic number.

68724046891 is a deficient number, since it is larger than the sum of its proper divisors (1).

68724046891 is an equidigital number, since it uses as much as digits as its factorization.

68724046891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 68724046891 in words is "sixty-eight billion, seven hundred twenty-four million, forty-six thousand, eight hundred ninety-one".