67782161 has 2 divisors, whose sum is σ = 67782162. Its totient is φ = 67782160.

The previous prime is 67782149. The next prime is 67782167. The reversal of 67782161 is 16128776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67486225 + 295936 = 8215^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 67782161 - 2⁶ = 67782097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67782167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33891080 + 33891081.

It is an arithmetic number, because the mean of its divisors is an integer number (33891081).

Almost surely, 2^67782161 is an apocalyptic number.

It is an amenable number.

67782161 is a deficient number, since it is larger than the sum of its proper divisors (1).

67782161 is an equidigital number, since it uses as much as digits as its factorization.

67782161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 67782161 is about 8232.9922264023. The cubic root of 67782161 is about 407.7291892012.

The spelling of 67782161 in words is "sixty-seven million, seven hundred eighty-two thousand, one hundred sixty-one".