67135661 has 2 divisors, whose sum is σ = 67135662. Its totient is φ = 67135660.

The previous prime is 67135631. The next prime is 67135697. The reversal of 67135661 is 16653176.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48038761 + 19096900 = 6931^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 67135661 - 2¹⁸ = 66873517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67135631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33567830 + 33567831.

It is an arithmetic number, because the mean of its divisors is an integer number (33567831).

Almost surely, 2^67135661 is an apocalyptic number.

It is an amenable number.

67135661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67135661 is an equidigital number, since it uses as much as digits as its factorization.

67135661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 67135661 is about 8193.6353958423. The cubic root of 67135661 is about 406.4287514437.

The spelling of 67135661 in words is "sixty-seven million, one hundred thirty-five thousand, six hundred sixty-one".