66600000666 has 48 divisors (see below), whose sum is σ = 156917675304. Its totient is φ = 20329408512.

The previous prime is 66600000659. The next prime is 66600000671.

66600000666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 65474062641 + 1125938025 = 255879^2 + 33555^2 .

It is a super-2 number, since 2×66600000666² (a number of 22 digits) contains 22 as substring.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66600000666.

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 23 ways as a sum of consecutive naturals, for example, 2929855 + ... + 2952498.

Almost surely, 2^66600000666 is an apocalyptic number.

66600000666 is an abundant number, since it is smaller than the sum of its proper divisors (90317674638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66600000666 is a wasteful number, since it uses less digits than its factorization.

66600000666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882415 (or 5882412 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

It can be divided in two parts, 66600000 and 666, that added together give a palindrome (66600666).

The spelling of 66600000666 in words is "sixty-six billion, six hundred million, six hundred sixty-six", and thus it is an aban number.