65666117 has 8 divisors (see below), whose sum is σ = 73302240. Its totient is φ = 58307760.

The previous prime is 65666113. The next prime is 65666123. The reversal of 65666117 is 71166656.

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 65666117 - 2² = 65666113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65666113) 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, 68942 + ... + 69887.

It is an arithmetic number, because the mean of its divisors is an integer number (9162780).

Almost surely, 2^65666117 is an apocalyptic number.

It is an amenable number.

65666117 is a deficient number, since it is larger than the sum of its proper divisors (7636123).

65666117 is a wasteful number, since it uses less digits than its factorization.

65666117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138883.

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

The square root of 65666117 is about 8103.4632719597. The cubic root of 65666117 is about 403.4413843577.

The spelling of 65666117 in words is "sixty-five million, six hundred sixty-six thousand, one hundred seventeen".