666435545534666 has 4 divisors (see below), whose sum is σ = 999653318302002. Its totient is φ = 333217772767332.

The previous prime is 666435545534659. The next prime is 666435545534761.

666435545534666 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 429750520680625 + 236685024854041 = 20730425^2 + 15384571^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666435545534593 and 666435545534602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166608886383665 + ... + 166608886383668.

Almost surely, 2^{666435545534666} is an apocalyptic number.

666435545534666 is a deficient number, since it is larger than the sum of its proper divisors (333217772767336).

666435545534666 is a wasteful number, since it uses less digits than its factorization.

666435545534666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333217772767335.

The product of its digits is 16796160000, while the sum is 74.

The spelling of 666435545534666 in words is "six hundred sixty-six trillion, four hundred thirty-five billion, five hundred forty-five million, five hundred thirty-four thousand, six hundred sixty-six".