666202666 has 8 divisors (see below), whose sum is σ = 1009198404. Its totient is φ = 329803200.

The previous prime is 666202639. The next prime is 666202697.

666202666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 643687641 + 22515025 = 25371^2 + 4745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1648815 + ... + 1649218.

Almost surely, 2^666202666 is an apocalyptic number.

666202666 is a deficient number, since it is larger than the sum of its proper divisors (342995738).

666202666 is a wasteful number, since it uses less digits than its factorization.

666202666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298136.

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 666202666 is about 25810.9020764482. The cubic root of 666202666 is about 873.3777467394.

The spelling of 666202666 in words is "six hundred sixty-six million, two hundred two thousand, six hundred sixty-six".