66673647 has 6 divisors (see below), whose sum is σ = 96306392. Its totient is φ = 44449092.

The previous prime is 66673631. The next prime is 66673657. The reversal of 66673647 is 74637666.

It is not a de Polignac number, because 66673647 - 2⁴ = 66673631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66673657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3704083 + ... + 3704100.

Almost surely, 2^66673647 is an apocalyptic number.

66673647 is a deficient number, since it is larger than the sum of its proper divisors (29632745).

66673647 is a wasteful number, since it uses less digits than its factorization.

66673647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7408189 (or 7408186 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 66673647 is about 8165.3932544612. The cubic root of 66673647 is about 405.4942844768.

The spelling of 66673647 in words is "sixty-six million, six hundred seventy-three thousand, six hundred forty-seven".