666056611 has 8 divisors (see below), whose sum is σ = 734099184. Its totient is φ = 599262720.

The previous prime is 666056597. The next prime is 666056639. The reversal of 666056611 is 116650666.

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

It is a cyclic number.

It is not a de Polignac number, because 666056611 - 2⁹ = 666056099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666056641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311050 + ... + 313183.

It is an arithmetic number, because the mean of its divisors is an integer number (91762398).

Almost surely, 2^666056611 is an apocalyptic number.

666056611 is a deficient number, since it is larger than the sum of its proper divisors (68042573).

666056611 is a wasteful number, since it uses less digits than its factorization.

666056611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624341.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 666056611 is about 25808.0725936673. The cubic root of 666056611 is about 873.3139170589.

The spelling of 666056611 in words is "six hundred sixty-six million, fifty-six thousand, six hundred eleven".