666545545666 has 64 divisors (see below), whose sum is σ = 1357497066240. Its totient is φ = 237023170560.

The previous prime is 666545545657. The next prime is 666545545697.

666545545666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666545545598 and 666545545607.

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, 1692271 + ... + 2048626.

It is an arithmetic number, because the mean of its divisors is an integer number (21210891660).

Almost surely, 2^666545545666 is an apocalyptic number.

666545545666 is an abundant number, since it is smaller than the sum of its proper divisors (690951520574).

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

666545545666 is a wasteful number, since it uses less digits than its factorization.

666545545666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741019.

The product of its digits is 466560000, while the sum is 64.

The spelling of 666545545666 in words is "six hundred sixty-six billion, five hundred forty-five million, five hundred forty-five thousand, six hundred sixty-six".