660338685 has 24 divisors (see below), whose sum is σ = 1147684824. Its totient is φ = 351227520.

The previous prime is 660338669. The next prime is 660338689. The reversal of 660338685 is 586833066.

660338685 is a `hidden beast` number, since 6 + 603 + 38 + 6 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1954404 + 658384281 = 1398^2 + 25659^2 .

It is not a de Polignac number, because 660338685 - 2⁴ = 660338669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 660338685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660338689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2886 + ... + 36455.

It is an arithmetic number, because the mean of its divisors is an integer number (47820201).

Almost surely, 2^660338685 is an apocalyptic number.

It is an amenable number.

660338685 is a deficient number, since it is larger than the sum of its proper divisors (487346139).

660338685 is a wasteful number, since it uses less digits than its factorization.

660338685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39725 (or 39722 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 660338685 is about 25697.0559597787. The cubic root of 660338685 is about 870.8076724707.

The spelling of 660338685 in words is "six hundred sixty million, three hundred thirty-eight thousand, six hundred eighty-five".