66417905 has 8 divisors (see below), whose sum is σ = 83166912. Its totient is φ = 50824048.

The previous prime is 66417899. The next prime is 66417943. The reversal of 66417905 is 50971466.

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 66417905 - 2⁸ = 66417649 is a prime.

It is a super-2 number, since 2×66417905² = 8822676209178050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 288659 + ... + 288888.

It is an arithmetic number, because the mean of its divisors is an integer number (10395864).

Almost surely, 2^66417905 is an apocalyptic number.

It is an amenable number.

66417905 is a deficient number, since it is larger than the sum of its proper divisors (16749007).

66417905 is a wasteful number, since it uses less digits than its factorization.

66417905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577575.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 66417905 is about 8149.7180932840. The cubic root of 66417905 is about 404.9751648643.

The spelling of 66417905 in words is "sixty-six million, four hundred seventeen thousand, nine hundred five".