68166689 has 2 divisors, whose sum is σ = 68166690. Its totient is φ = 68166688.

The previous prime is 68166677. The next prime is 68166697. The reversal of 68166689 is 98666186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67782289 + 384400 = 8233^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 68166689 - 2¹⁶ = 68101153 is a prime.

It is not a weakly prime, because it can be changed into another prime (68166629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34083344 + 34083345.

It is an arithmetic number, because the mean of its divisors is an integer number (34083345).

Almost surely, 2^68166689 is an apocalyptic number.

It is an amenable number.

68166689 is a deficient number, since it is larger than the sum of its proper divisors (1).

68166689 is an equidigital number, since it uses as much as digits as its factorization.

68166689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 68166689 is about 8256.3120701679. The cubic root of 68166689 is about 408.4987512865.

The spelling of 68166689 in words is "sixty-eight million, one hundred sixty-six thousand, six hundred eighty-nine".