66079609 has 2 divisors, whose sum is σ = 66079610. Its totient is φ = 66079608.

The previous prime is 66079591. The next prime is 66079619. The reversal of 66079609 is 90697066.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 4410000 = 7853^2 + 2100^2 .

It is a cyclic number.

It is not a de Polignac number, because 66079609 - 2¹⁷ = 65948537 is a prime.

It is not a weakly prime, because it can be changed into another prime (66079619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33039804 + 33039805.

It is an arithmetic number, because the mean of its divisors is an integer number (33039805).

Almost surely, 2^66079609 is an apocalyptic number.

It is an amenable number.

66079609 is a deficient number, since it is larger than the sum of its proper divisors (1).

66079609 is an equidigital number, since it uses as much as digits as its factorization.

66079609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 66079609 is about 8128.9365233098. The cubic root of 66079609 is about 404.2864211588.

The spelling of 66079609 in words is "sixty-six million, seventy-nine thousand, six hundred nine".