66617323417 has 4 divisors (see below), whose sum is σ = 66629382016. Its totient is φ = 66605264820.

The previous prime is 66617323391. The next prime is 66617323433. The reversal of 66617323417 is 71432371666.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66617323417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66617323457) 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, 6021009 + ... + 6032062.

It is an arithmetic number, because the mean of its divisors is an integer number (16657345504).

Almost surely, 2^66617323417 is an apocalyptic number.

It is an amenable number.

66617323417 is a deficient number, since it is larger than the sum of its proper divisors (12058599).

66617323417 is a wasteful number, since it uses less digits than its factorization.

66617323417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12058598.

The product of its digits is 762048, while the sum is 46.

The spelling of 66617323417 in words is "sixty-six billion, six hundred seventeen million, three hundred twenty-three thousand, four hundred seventeen".