667041009 has 16 divisors (see below), whose sum is σ = 929664000. Its totient is φ = 424623056.

The previous prime is 667041007. The next prime is 667041031. The reversal of 667041009 is 900140766.

It is a happy number.

It is not a de Polignac number, because 667041009 - 2¹ = 667041007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667041007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33262 + ... + 49400.

It is an arithmetic number, because the mean of its divisors is an integer number (58104000).

Almost surely, 2^667041009 is an apocalyptic number.

667041009 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

667041009 is a deficient number, since it is larger than the sum of its proper divisors (262622991).

667041009 is a wasteful number, since it uses less digits than its factorization.

667041009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16764.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 667041009 is about 25827.1370654976. The cubic root of 667041009 is about 873.7439432164.

The spelling of 667041009 in words is "six hundred sixty-seven million, forty-one thousand, nine".