660005655 has 32 divisors (see below), whose sum is σ = 1092311040. Its totient is φ = 339949440.

The previous prime is 660005653. The next prime is 660005663. The reversal of 660005655 is 556500066.

It is not a de Polignac number, because 660005655 - 2¹ = 660005653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660005651) 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, 286689 + ... + 288981.

It is an arithmetic number, because the mean of its divisors is an integer number (34134720).

Almost surely, 2^660005655 is an apocalyptic number.

660005655 is a deficient number, since it is larger than the sum of its proper divisors (432305385).

660005655 is a wasteful number, since it uses less digits than its factorization.

660005655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 660005655 is about 25690.5752173827. The cubic root of 660005655 is about 870.6612557645.

The spelling of 660005655 in words is "six hundred sixty million, five thousand, six hundred fifty-five".