660105009 has 12 divisors (see below), whose sum is σ = 958755252. Its totient is φ = 437637600.

The previous prime is 660105007. The next prime is 660105013. The reversal of 660105009 is 900501066.

660105009 is a `hidden beast` number, since 6 + 601 + 0 + 50 + 0 + 9 = 666.

660105009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 126495009 + 533610000 = 11247^2 + 23100^2 .

It is not a de Polignac number, because 660105009 - 2¹ = 660105007 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (660105007) 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, 200982 + ... + 204239.

It is an arithmetic number, because the mean of its divisors is an integer number (79896271).

Almost surely, 2^660105009 is an apocalyptic number.

It is an amenable number.

660105009 is a deficient number, since it is larger than the sum of its proper divisors (298650243).

660105009 is a wasteful number, since it uses less digits than its factorization.

660105009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405408 (or 405405 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 660105009 is about 25692.5088109355. The cubic root of 660105009 is about 870.7049419246.

The spelling of 660105009 in words is "six hundred sixty million, one hundred five thousand, nine".