67696561 has 2 divisors, whose sum is σ = 67696562. Its totient is φ = 67696560.

The previous prime is 67696549. The next prime is 67696609. The reversal of 67696561 is 16569676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45427600 + 22268961 = 6740^2 + 4719^2 .

It is a cyclic number.

It is not a de Polignac number, because 67696561 - 2⁹ = 67696049 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (67696501) 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, 33848280 + 33848281.

It is an arithmetic number, because the mean of its divisors is an integer number (33848281).

Almost surely, 2^67696561 is an apocalyptic number.

It is an amenable number.

67696561 is a deficient number, since it is larger than the sum of its proper divisors (1).

67696561 is an equidigital number, since it uses as much as digits as its factorization.

67696561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 67696561 is about 8227.7919881339. The cubic root of 67696561 is about 407.5574806943.

The spelling of 67696561 in words is "sixty-seven million, six hundred ninety-six thousand, five hundred sixty-one".