66042017 has 4 divisors (see below), whose sum is σ = 66222336. Its totient is φ = 65861700.

The previous prime is 66042007. The next prime is 66042029. The reversal of 66042017 is 71024066.

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: 71024066 = 2 ⋅35512033.

It is a cyclic number.

It is not a de Polignac number, because 66042017 - 2⁴ = 66042001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66042007) 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, 89609 + ... + 90342.

It is an arithmetic number, because the mean of its divisors is an integer number (16555584).

Almost surely, 2^66042017 is an apocalyptic number.

It is an amenable number.

66042017 is a deficient number, since it is larger than the sum of its proper divisors (180319).

66042017 is a wasteful number, since it uses less digits than its factorization.

66042017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180318.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 66042017 is about 8126.6239607847. The cubic root of 66042017 is about 404.2097418409.

The spelling of 66042017 in words is "sixty-six million, forty-two thousand, seventeen".