67943491842221 has 2 divisors, whose sum is σ = 67943491842222. Its totient is φ = 67943491842220.

The previous prime is 67943491842203. The next prime is 67943491842241. The reversal of 67943491842221 is 12224819434976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52221362809225 + 15722129032996 = 7226435^2 + 3965114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67943491842221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67943491842241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33971745921110 + 33971745921111.

It is an arithmetic number, because the mean of its divisors is an integer number (33971745921111).

Almost surely, 2^{67943491842221} is an apocalyptic number.

It is an amenable number.

67943491842221 is a deficient number, since it is larger than the sum of its proper divisors (1).

67943491842221 is an equidigital number, since it uses as much as digits as its factorization.

67943491842221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41803776, while the sum is 62.

The spelling of 67943491842221 in words is "sixty-seven trillion, nine hundred forty-three billion, four hundred ninety-one million, eight hundred forty-two thousand, two hundred twenty-one".