660511009 has 2 divisors, whose sum is σ = 660511010. Its totient is φ = 660511008.

The previous prime is 660510997. The next prime is 660511031. The reversal of 660511009 is 900115066.

660511009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636451984 + 24059025 = 25228^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 660511009 - 2²¹ = 658413857 is a prime.

It is equal to p_34311358 and since 660511009 and 34311358 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (660511109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330255504 + 330255505.

It is an arithmetic number, because the mean of its divisors is an integer number (330255505).

Almost surely, 2^660511009 is an apocalyptic number.

It is an amenable number.

660511009 is a deficient number, since it is larger than the sum of its proper divisors (1).

660511009 is an equidigital number, since it uses as much as digits as its factorization.

660511009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 660511009 is about 25700.4087321583. The cubic root of 660511009 is about 870.8834154256.

The spelling of 660511009 in words is "six hundred sixty million, five hundred eleven thousand, nine".