660056661 has 32 divisors (see below), whose sum is σ = 1084275840. Its totient is φ = 393465600.

The previous prime is 660056641. The next prime is 660056689. The reversal of 660056661 is 166650066.

It is not a de Polignac number, because 660056661 - 2¹⁰ = 660055637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660056641) 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 31 ways as a sum of consecutive naturals, for example, 100 + ... + 36333.

It is an arithmetic number, because the mean of its divisors is an integer number (33883620).

Almost surely, 2^660056661 is an apocalyptic number.

660056661 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

660056661 is a deficient number, since it is larger than the sum of its proper divisors (424219179).

660056661 is a wasteful number, since it uses less digits than its factorization.

660056661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36514 (or 36508 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 660056661 is about 25691.5678968801. The cubic root of 660056661 is about 870.6836837562.

The spelling of 660056661 in words is "six hundred sixty million, fifty-six thousand, six hundred sixty-one".