66606867 has 20 divisors (see below), whose sum is σ = 105354216. Its totient is φ = 41791680.

The previous prime is 66606847. The next prime is 66606889. The reversal of 66606867 is 76860666.

It is a happy number.

It is not a de Polignac number, because 66606867 - 2⁸ = 66606611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66606847) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22809 + ... + 25562.

Almost surely, 2^66606867 is an apocalyptic number.

66606867 is a deficient number, since it is larger than the sum of its proper divisors (38747349).

66606867 is a wasteful number, since it uses less digits than its factorization.

66606867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48400 (or 48391 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 66606867 is about 8161.3030209642. The cubic root of 66606867 is about 405.3588588862.

The spelling of 66606867 in words is "sixty-six million, six hundred six thousand, eight hundred sixty-seven".