664339331 has 4 divisors (see below), whose sum is σ = 685769664. Its totient is φ = 642909000.

The previous prime is 664339321. The next prime is 664339339. The reversal of 664339331 is 133933466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133933466 = 2 ⋅66966733.

It is not a de Polignac number, because 664339331 - 2¹⁴ = 664322947 is a prime.

It is a super-2 number, since 2×664339331² = 882693493427055122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664339339) 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, 10715120 + ... + 10715181.

It is an arithmetic number, because the mean of its divisors is an integer number (171442416).

Almost surely, 2^664339331 is an apocalyptic number.

664339331 is a deficient number, since it is larger than the sum of its proper divisors (21430333).

664339331 is a wasteful number, since it uses less digits than its factorization.

664339331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21430332.

The product of its digits is 104976, while the sum is 38.

The square root of 664339331 is about 25774.7809108050. The cubic root of 664339331 is about 872.5627220148.

The spelling of 664339331 in words is "six hundred sixty-four million, three hundred thirty-nine thousand, three hundred thirty-one".