66717017 has 4 divisors (see below), whose sum is σ = 68136576. Its totient is φ = 65297460.

The previous prime is 66717011. The next prime is 66717029. The reversal of 66717017 is 71071766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71071766 = 2 ⋅35535883.

It is a cyclic number.

It is not a de Polignac number, because 66717017 - 2⁶ = 66716953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66717011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709709 + ... + 709802.

It is an arithmetic number, because the mean of its divisors is an integer number (17034144).

Almost surely, 2^66717017 is an apocalyptic number.

It is an amenable number.

66717017 is a deficient number, since it is larger than the sum of its proper divisors (1419559).

66717017 is a wasteful number, since it uses less digits than its factorization.

66717017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419558.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 66717017 is about 8168.0485429508. The cubic root of 66717017 is about 405.5821876494.

The spelling of 66717017 in words is "sixty-six million, seven hundred seventeen thousand, seventeen".