68018627641 has 2 divisors, whose sum is σ = 68018627642. Its totient is φ = 68018627640.

The previous prime is 68018627639. The next prime is 68018627657. The reversal of 68018627641 is 14672681086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60656301225 + 7362326416 = 246285^2 + 85804^2 .

It is a cyclic number.

It is not a de Polignac number, because 68018627641 - 2¹ = 68018627639 is a prime.

Together with 68018627639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68018627681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34009313820 + 34009313821.

It is an arithmetic number, because the mean of its divisors is an integer number (34009313821).

Almost surely, 2^68018627641 is an apocalyptic number.

It is an amenable number.

68018627641 is a deficient number, since it is larger than the sum of its proper divisors (1).

68018627641 is an equidigital number, since it uses as much as digits as its factorization.

68018627641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 68018627641 in words is "sixty-eight billion, eighteen million, six hundred twenty-seven thousand, six hundred forty-one".