660610066 has 8 divisors (see below), whose sum is σ = 991064844. Its totient is φ = 330255120.

The previous prime is 660610063. The next prime is 660610121. The reversal of 660610066 is 660016066.

It can be written as a sum of positive squares in 2 ways, for example, as 659411041 + 1199025 = 25679^2 + 1095^2 .

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

It is not an unprimeable number, because it can be changed into a prime (660610063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5325 + ... + 36736.

Almost surely, 2^660610066 is an apocalyptic number.

660610066 is a deficient number, since it is larger than the sum of its proper divisors (330454778).

660610066 is a wasteful number, since it uses less digits than its factorization.

660610066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49916.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 660610066 is about 25702.3358082490. The cubic root of 660610066 is about 870.9269487835.

The spelling of 660610066 in words is "six hundred sixty million, six hundred ten thousand, sixty-six".