65166115617 has 12 divisors (see below), whose sum is σ = 94185321360. Its totient is φ = 43418005848.

The previous prime is 65166115613. The next prime is 65166115711. The reversal of 65166115617 is 71651166156.

65166115617 is a `hidden beast` number, since 6 + 5 + 16 + 6 + 1 + 15 + 617 = 666.

It is not a de Polignac number, because 65166115617 - 2² = 65166115613 is a prime.

It is a super-2 number, since 2×65166115617² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65166115613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2156767 + ... + 2186772.

It is an arithmetic number, because the mean of its divisors is an integer number (7848776780).

Almost surely, 2^65166115617 is an apocalyptic number.

It is an amenable number.

65166115617 is a deficient number, since it is larger than the sum of its proper divisors (29019205743).

65166115617 is a wasteful number, since it uses less digits than its factorization.

65166115617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4345212 (or 4345209 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The spelling of 65166115617 in words is "sixty-five billion, one hundred sixty-six million, one hundred fifteen thousand, six hundred seventeen".