66970609 has 4 divisors (see below), whose sum is σ = 67138020. Its totient is φ = 66803200.

The previous prime is 66970601. The next prime is 66970613. The reversal of 66970609 is 90607966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33965584 + 33005025 = 5828^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 66970609 - 2³ = 66970601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66970601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83104 + ... + 83905.

It is an arithmetic number, because the mean of its divisors is an integer number (16784505).

Almost surely, 2^66970609 is an apocalyptic number.

It is an amenable number.

66970609 is a deficient number, since it is larger than the sum of its proper divisors (167411).

66970609 is a wasteful number, since it uses less digits than its factorization.

66970609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167410.

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

The square root of 66970609 is about 8183.5572338684. The cubic root of 66970609 is about 406.0954118258.

The spelling of 66970609 in words is "sixty-six million, nine hundred seventy thousand, six hundred nine".