66398017 has 8 divisors (see below), whose sum is σ = 77934656. Its totient is φ = 55374192.

The previous prime is 66397979. The next prime is 66398041. The reversal of 66398017 is 71089366.

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 66398017 - 2¹¹ = 66395969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66398047) 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, 127923 + ... + 128440.

It is an arithmetic number, because the mean of its divisors is an integer number (9741832).

Almost surely, 2^66398017 is an apocalyptic number.

It is an amenable number.

66398017 is a deficient number, since it is larger than the sum of its proper divisors (11536639).

66398017 is a wasteful number, since it uses less digits than its factorization.

66398017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256407.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66398017 is about 8148.4978370249. The cubic root of 66398017 is about 404.9347392687.

The spelling of 66398017 in words is "sixty-six million, three hundred ninety-eight thousand, seventeen".