68660689 has 2 divisors, whose sum is σ = 68660690. Its totient is φ = 68660688.

The previous prime is 68660687. The next prime is 68660693. The reversal of 68660689 is 98606686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68310225 + 350464 = 8265^2 + 592^2 .

It is a cyclic number.

It is not a de Polignac number, because 68660689 - 2¹ = 68660687 is a prime.

Together with 68660687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68660687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34330344 + 34330345.

It is an arithmetic number, because the mean of its divisors is an integer number (34330345).

Almost surely, 2^68660689 is an apocalyptic number.

It is an amenable number.

68660689 is a deficient number, since it is larger than the sum of its proper divisors (1).

68660689 is an equidigital number, since it uses as much as digits as its factorization.

68660689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 68660689 is about 8286.1745697276. The cubic root of 68660689 is about 409.4831659401.

The spelling of 68660689 in words is "sixty-eight million, six hundred sixty thousand, six hundred eighty-nine".