68921000009 has 2 divisors, whose sum is σ = 68921000010. Its totient is φ = 68921000008.

The previous prime is 68920999997. The next prime is 68921000021. The reversal of 68921000009 is 90000012986.

It is a balanced prime because it is at equal distance from previous prime (68920999997) and next prime (68921000021).

It can be written as a sum of positive squares in only one way, i.e., 67101721600 + 1819278409 = 259040^2 + 42653^2 .

It is a cyclic number.

It is not a de Polignac number, because 68921000009 - 2¹⁶ = 68920934473 is a prime.

It is not a weakly prime, because it can be changed into another prime (68921000089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34460500004 + 34460500005.

It is an arithmetic number, because the mean of its divisors is an integer number (34460500005).

Almost surely, 2^68921000009 is an apocalyptic number.

It is an amenable number.

68921000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

68921000009 is an equidigital number, since it uses as much as digits as its factorization.

68921000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 68921000009 in words is "sixty-eight billion, nine hundred twenty-one million, nine", and thus it is an aban number.