66675009 has 16 divisors (see below), whose sum is σ = 93876480. Its totient is φ = 41976720.

The previous prime is 66675001. The next prime is 66675029. The reversal of 66675009 is 90057666.

It is a happy number.

66675009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66675009 - 2³ = 66675001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66675001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18094 + ... + 21464.

It is an arithmetic number, because the mean of its divisors is an integer number (5867280).

Almost surely, 2^66675009 is an apocalyptic number.

It is an amenable number.

66675009 is a deficient number, since it is larger than the sum of its proper divisors (27201471).

66675009 is a wasteful number, since it uses less digits than its factorization.

66675009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 66675009 is about 8165.4766547949. The cubic root of 66675009 is about 405.4970455849.

It can be divided in two parts, 666 and 75009, that multiplied together give a palindrome (49955994).

The spelling of 66675009 in words is "sixty-six million, six hundred seventy-five thousand, nine".