664439511 has 8 divisors (see below), whose sum is σ = 900442864. Its totient is φ = 435697920.

The previous prime is 664439497. The next prime is 664439521. The reversal of 664439511 is 115934466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664439511 - 2¹³ = 664431319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664439511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664439521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1815226 + ... + 1815591.

It is an arithmetic number, because the mean of its divisors is an integer number (112555358).

Almost surely, 2^664439511 is an apocalyptic number.

664439511 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

664439511 is a deficient number, since it is larger than the sum of its proper divisors (236003353).

664439511 is a wasteful number, since it uses less digits than its factorization.

664439511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630881.

The product of its digits is 77760, while the sum is 39.

The square root of 664439511 is about 25776.7242100310. The cubic root of 664439511 is about 872.6065795918.

The spelling of 664439511 in words is "six hundred sixty-four million, four hundred thirty-nine thousand, five hundred eleven".