664015430909 has 4 divisors (see below), whose sum is σ = 668792520480. Its totient is φ = 659238341340.

The previous prime is 664015430861. The next prime is 664015430959. The reversal of 664015430909 is 909034510466.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-664015430909 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 (664015430959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2388544577 + ... + 2388544854.

It is an arithmetic number, because the mean of its divisors is an integer number (167198130120).

Almost surely, 2^664015430909 is an apocalyptic number.

It is an amenable number.

664015430909 is a deficient number, since it is larger than the sum of its proper divisors (4777089571).

664015430909 is a wasteful number, since it uses less digits than its factorization.

664015430909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777089570.

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 664015430909 in words is "six hundred sixty-four billion, fifteen million, four hundred thirty thousand, nine hundred nine".