67345020661 has 2 divisors, whose sum is σ = 67345020662. Its totient is φ = 67345020660.

The previous prime is 67345020647. The next prime is 67345020667. The reversal of 67345020661 is 16602054376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67304443761 + 40576900 = 259431^2 + 6370^2 .

It is a cyclic number.

It is not a de Polignac number, because 67345020661 - 2¹¹ = 67345018613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67345020667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33672510330 + 33672510331.

It is an arithmetic number, because the mean of its divisors is an integer number (33672510331).

Almost surely, 2^67345020661 is an apocalyptic number.

It is an amenable number.

67345020661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67345020661 is an equidigital number, since it uses as much as digits as its factorization.

67345020661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 67345020661 in words is "sixty-seven billion, three hundred forty-five million, twenty thousand, six hundred sixty-one".