664068109 has 4 divisors (see below), whose sum is σ = 664739200. Its totient is φ = 663397020.

The previous prime is 664068101. The next prime is 664068113. The reversal of 664068109 is 901860466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664068109 - 2³ = 664068101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664068101) 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 3 ways as a sum of consecutive naturals, for example, 334059 + ... + 336040.

It is an arithmetic number, because the mean of its divisors is an integer number (166184800).

Almost surely, 2^664068109 is an apocalyptic number.

It is an amenable number.

664068109 is a deficient number, since it is larger than the sum of its proper divisors (671091).

664068109 is an equidigital number, since it uses as much as digits as its factorization.

664068109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671090.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 664068109 is about 25769.5189904662. The cubic root of 664068109 is about 872.4439622140.

The spelling of 664068109 in words is "six hundred sixty-four million, sixty-eight thousand, one hundred nine".