666616011 has 16 divisors (see below), whose sum is σ = 921715200. Its totient is φ = 428038688.

The previous prime is 666615973. The next prime is 666616021. The reversal of 666616011 is 110616666.

It is a cyclic number.

It is not a de Polignac number, because 666616011 - 2¹⁰ = 666614987 is a prime.

It is a super-2 number, since 2×666616011² = 888753812243104242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666616021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27310 + ... + 45596.

It is an arithmetic number, because the mean of its divisors is an integer number (57607200).

Almost surely, 2^666616011 is an apocalyptic number.

666616011 is a deficient number, since it is larger than the sum of its proper divisors (255099189).

666616011 is a wasteful number, since it uses less digits than its factorization.

666616011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18738.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 666616011 is about 25818.9080133146. The cubic root of 666616011 is about 873.5583382755.

The spelling of 666616011 in words is "six hundred sixty-six million, six hundred sixteen thousand, eleven".