68666651 has 2 divisors, whose sum is σ = 68666652. Its totient is φ = 68666650.

The previous prime is 68666639. The next prime is 68666681. The reversal of 68666651 is 15666686.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68666651 is a prime.

It is not a weakly prime, because it can be changed into another prime (68666681) 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, 34333325 + 34333326.

It is an arithmetic number, because the mean of its divisors is an integer number (34333326).

Almost surely, 2^68666651 is an apocalyptic number.

68666651 is a deficient number, since it is larger than the sum of its proper divisors (1).

68666651 is an equidigital number, since it uses as much as digits as its factorization.

68666651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 68666651 is about 8286.5343177953. The cubic root of 68666651 is about 409.4950177873.

The spelling of 68666651 in words is "sixty-eight million, six hundred sixty-six thousand, six hundred fifty-one".