66665456666 has 16 divisors (see below), whose sum is σ = 100192163328. Its totient is φ = 33268107600.

The previous prime is 66665456623. The next prime is 66665456681.

66665456666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66665456666² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66665456599 and 66665456608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4360151 + ... + 4375413.

It is an arithmetic number, because the mean of its divisors is an integer number (6262010208).

Almost surely, 2^66665456666 is an apocalyptic number.

66665456666 is a deficient number, since it is larger than the sum of its proper divisors (33526706662).

66665456666 is a wasteful number, since it uses less digits than its factorization.

66665456666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19357.

The product of its digits is 167961600, while the sum is 62.

The spelling of 66665456666 in words is "sixty-six billion, six hundred sixty-five million, four hundred fifty-six thousand, six hundred sixty-six".