666511106 has 4 divisors (see below), whose sum is σ = 999766662. Its totient is φ = 333255552.

The previous prime is 666511103. The next prime is 666511123. The reversal of 666511106 is 601115666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601115666 = 2 ⋅300557833.

It can be written as a sum of positive squares in only one way, i.e., 484396081 + 182115025 = 22009^2 + 13495^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666511103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166627775 + ... + 166627778.

Almost surely, 2^666511106 is an apocalyptic number.

666511106 is a deficient number, since it is larger than the sum of its proper divisors (333255556).

666511106 is a wasteful number, since it uses less digits than its factorization.

666511106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333255555.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 666511106 is about 25816.8763796087. The cubic root of 666511106 is about 873.5125120709.

It can be divided in two parts, 6665 and 11106, that added together give a palindrome (17771).

The spelling of 666511106 in words is "six hundred sixty-six million, five hundred eleven thousand, one hundred six".