11665301666 has 4 divisors (see below), whose sum is σ = 17497952502. Its totient is φ = 5832650832.

The previous prime is 11665301653. The next prime is 11665301671. The reversal of 11665301666 is 66610356611.

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., 9239246641 + 2426055025 = 96121^2 + 49255^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2916325415 + ... + 2916325418.

Almost surely, 2^11665301666 is an apocalyptic number.

11665301666 is a deficient number, since it is larger than the sum of its proper divisors (5832650836).

11665301666 is an equidigital number, since it uses as much as digits as its factorization.

11665301666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832650835.

The product of its (nonzero) digits is 116640, while the sum is 41.

Subtracting 11665301666 from its reverse (66610356611), we obtain a palindrome (54945054945).

The spelling of 11665301666 in words is "eleven billion, six hundred sixty-five million, three hundred one thousand, six hundred sixty-six".