67055561 has 2 divisors, whose sum is σ = 67055562. Its totient is φ = 67055560.

The previous prime is 67055539. The next prime is 67055591. The reversal of 67055561 is 16555076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36529936 + 30525625 = 6044^2 + 5525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67055561 is a prime.

It is a super-2 number, since 2×67055561² = 8992896522049442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67055591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33527780 + 33527781.

It is an arithmetic number, because the mean of its divisors is an integer number (33527781).

Almost surely, 2^67055561 is an apocalyptic number.

It is an amenable number.

67055561 is a deficient number, since it is larger than the sum of its proper divisors (1).

67055561 is an equidigital number, since it uses as much as digits as its factorization.

67055561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 67055561 is about 8188.7459967934. The cubic root of 67055561 is about 406.2670495093.

The spelling of 67055561 in words is "sixty-seven million, fifty-five thousand, five hundred sixty-one".