66458717 has 8 divisors (see below), whose sum is σ = 72229080. Its totient is φ = 60782400.

The previous prime is 66458687. The next prime is 66458723. The reversal of 66458717 is 71785466.

It can be written as a sum of positive squares in 4 ways, for example, as 19412836 + 47045881 = 4406^2 + 6859^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66458717 - 2⁸ = 66458461 is a prime.

It is a super-2 number, since 2×66458717² = 8833522130572178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66458737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22034 + ... + 24867.

It is an arithmetic number, because the mean of its divisors is an integer number (9028635).

Almost surely, 2^66458717 is an apocalyptic number.

It is an amenable number.

66458717 is a deficient number, since it is larger than the sum of its proper divisors (5770363).

66458717 is a wasteful number, since it uses less digits than its factorization.

66458717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47023.

The product of its digits is 282240, while the sum is 44.

The square root of 66458717 is about 8152.2215990489. The cubic root of 66458717 is about 405.0580966294.

The spelling of 66458717 in words is "sixty-six million, four hundred fifty-eight thousand, seven hundred seventeen".