67108661 has 2 divisors, whose sum is σ = 67108662. Its totient is φ = 67108660.

The previous prime is 67108649. The next prime is 67108667. The reversal of 67108661 is 16680176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38056561 + 29052100 = 6169^2 + 5390^2 .

It is a cyclic number.

It is not a de Polignac number, because 67108661 - 2⁶ = 67108597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67108667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33554330 + 33554331.

It is an arithmetic number, because the mean of its divisors is an integer number (33554331).

Almost surely, 2^67108661 is an apocalyptic number.

It is an amenable number.

67108661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67108661 is an equidigital number, since it uses as much as digits as its factorization.

67108661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 67108661 is about 8191.9876098539. The cubic root of 67108661 is about 406.3742595510.

The spelling of 67108661 in words is "sixty-seven million, one hundred eight thousand, six hundred sixty-one".