68021562289 has 2 divisors, whose sum is σ = 68021562290. Its totient is φ = 68021562288.

The previous prime is 68021562281. The next prime is 68021562317. The reversal of 68021562289 is 98226512086.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64710710689 + 3310851600 = 254383^2 + 57540^2 .

It is a cyclic number.

It is not a de Polignac number, because 68021562289 - 2³ = 68021562281 is a prime.

It is not a weakly prime, because it can be changed into another prime (68021562281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34010781144 + 34010781145.

It is an arithmetic number, because the mean of its divisors is an integer number (34010781145).

Almost surely, 2^68021562289 is an apocalyptic number.

It is an amenable number.

68021562289 is a deficient number, since it is larger than the sum of its proper divisors (1).

68021562289 is an equidigital number, since it uses as much as digits as its factorization.

68021562289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 68021562289 in words is "sixty-eight billion, twenty-one million, five hundred sixty-two thousand, two hundred eighty-nine".