66971017 has 4 divisors (see below), whose sum is σ = 67585540. Its totient is φ = 66356496.

The previous prime is 66970961. The next prime is 66971053. The reversal of 66971017 is 71017966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71017966 = 2 ⋅35508983.

It can be written as a sum of positive squares in 2 ways, for example, as 22934521 + 44036496 = 4789^2 + 6636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66971017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66971057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307098 + ... + 307315.

It is an arithmetic number, because the mean of its divisors is an integer number (16896385).

Almost surely, 2^66971017 is an apocalyptic number.

It is an amenable number.

66971017 is a deficient number, since it is larger than the sum of its proper divisors (614523).

66971017 is a wasteful number, since it uses less digits than its factorization.

66971017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614522.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 66971017 is about 8183.5821618653. The cubic root of 66971017 is about 406.0962364990.

The spelling of 66971017 in words is "sixty-six million, nine hundred seventy-one thousand, seventeen".