66630717 has 12 divisors (see below), whose sum is σ = 96342844. Its totient is φ = 44375040.

The previous prime is 66630709. The next prime is 66630743. The reversal of 66630717 is 71703666.

It can be written as a sum of positive squares in 2 ways, for example, as 35928036 + 30702681 = 5994^2 + 5541^2 .

It is not a de Polignac number, because 66630717 - 2³ = 66630709 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 (66630797) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7167 + ... + 13587.

Almost surely, 2^66630717 is an apocalyptic number.

It is an amenable number.

66630717 is a deficient number, since it is larger than the sum of its proper divisors (29712127).

66630717 is a wasteful number, since it uses less digits than its factorization.

66630717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7580 (or 7577 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 66630717 is about 8162.7640539219. The cubic root of 66630717 is about 405.4072355553.

The spelling of 66630717 in words is "sixty-six million, six hundred thirty thousand, seven hundred seventeen".