67279661 has 2 divisors, whose sum is σ = 67279662. Its totient is φ = 67279660.

The previous prime is 67279657. The next prime is 67279673. The reversal of 67279661 is 16697276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 10201636 = 7555^2 + 3194^2 .

It is a cyclic number.

It is not a de Polignac number, because 67279661 - 2² = 67279657 is a prime.

It is a Sophie Germain 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 (67279621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33639830 + 33639831.

It is an arithmetic number, because the mean of its divisors is an integer number (33639831).

Almost surely, 2^67279661 is an apocalyptic number.

It is an amenable number.

67279661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67279661 is an equidigital number, since it uses as much as digits as its factorization.

67279661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The square root of 67279661 is about 8202.4179971518. The cubic root of 67279661 is about 406.7191283957.

The spelling of 67279661 in words is "sixty-seven million, two hundred seventy-nine thousand, six hundred sixty-one".