68651641 has 2 divisors, whose sum is σ = 68651642. Its totient is φ = 68651640.

The previous prime is 68651623. The next prime is 68651669. The reversal of 68651641 is 14615686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59675625 + 8976016 = 7725^2 + 2996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68651641 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68651641.

It is not a weakly prime, because it can be changed into another prime (68651621) 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, 34325820 + 34325821.

It is an arithmetic number, because the mean of its divisors is an integer number (34325821).

Almost surely, 2^68651641 is an apocalyptic number.

It is an amenable number.

68651641 is a deficient number, since it is larger than the sum of its proper divisors (1).

68651641 is an equidigital number, since it uses as much as digits as its factorization.

68651641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 68651641 is about 8285.6285820691. The cubic root of 68651641 is about 409.4651781293.

The spelling of 68651641 in words is "sixty-eight million, six hundred fifty-one thousand, six hundred forty-one".