666065560666 has 64 divisors (see below), whose sum is σ = 1194320350080. Its totient is φ = 275009781760.

The previous prime is 666065560627. The next prime is 666065560673.

It is a happy number.

666065560666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×666065560666² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 666065560666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29847885 + ... + 29870191.

It is an arithmetic number, because the mean of its divisors is an integer number (18661255470).

Almost surely, 2^666065560666 is an apocalyptic number.

666065560666 is a deficient number, since it is larger than the sum of its proper divisors (528254789414).

666065560666 is a wasteful number, since it uses less digits than its factorization.

666065560666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25119.

The product of its (nonzero) digits is 41990400, while the sum is 58.

The spelling of 666065560666 in words is "six hundred sixty-six billion, sixty-five million, five hundred sixty thousand, six hundred sixty-six".