660085866 has 24 divisors (see below), whose sum is σ = 1560203424. Its totient is φ = 200025960.

The previous prime is 660085861. The next prime is 660085871. The reversal of 660085866 is 668580066.

660085866 is a `hidden beast` number, since 6 + 60 + 0 + 8 + 586 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (660085861) and next prime (660085871).

It is not an unprimeable number, because it can be changed into a prime (660085861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1666686 + ... + 1667081.

It is an arithmetic number, because the mean of its divisors is an integer number (65008476).

Almost surely, 2^660085866 is an apocalyptic number.

660085866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

660085866 is an abundant number, since it is smaller than the sum of its proper divisors (900117558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660085866 is a wasteful number, since it uses less digits than its factorization.

660085866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333786 (or 3333783 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 660085866 is about 25692.1362677376. The cubic root of 660085866 is about 870.6965250487.

The spelling of 660085866 in words is "six hundred sixty million, eighty-five thousand, eight hundred sixty-six".