666511006 has 16 divisors (see below), whose sum is σ = 1170459360. Its totient is φ = 278680320.

The previous prime is 666510991. The next prime is 666511037. The reversal of 666511006 is 600115666.

666511006 = 414² + 415² + ... + 1274².

It is a super-2 number, since 2×666511006² = 888473842238264072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580011 + ... + 581158.

It is an arithmetic number, because the mean of its divisors is an integer number (73153710).

Almost surely, 2^666511006 is an apocalyptic number.

666511006 is a deficient number, since it is larger than the sum of its proper divisors (503948354).

666511006 is a wasteful number, since it uses less digits than its factorization.

666511006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161219.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 666511006 is about 25816.8744428910. The cubic root of 666511006 is about 873.5124683851.

It can be divided in two parts, 6665 and 11006, that added together give a palindrome (17671).

The spelling of 666511006 in words is "six hundred sixty-six million, five hundred eleven thousand, six".