664819831 has 8 divisors (see below), whose sum is σ = 739055744. Its totient is φ = 593883360.

The previous prime is 664819829. The next prime is 664819843. The reversal of 664819831 is 138918466.

664819831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 664819831 - 2¹ = 664819829 is a prime.

It is a super-2 number, since 2×664819831² = 883970815381737122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664819801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 824436 + ... + 825241.

It is an arithmetic number, because the mean of its divisors is an integer number (92381968).

Almost surely, 2^664819831 is an apocalyptic number.

664819831 is a deficient number, since it is larger than the sum of its proper divisors (74235913).

664819831 is a wasteful number, since it uses less digits than its factorization.

664819831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649721.

The product of its digits is 248832, while the sum is 46.

The square root of 664819831 is about 25784.1003527368. The cubic root of 664819831 is about 872.7730389053.

The spelling of 664819831 in words is "six hundred sixty-four million, eight hundred nineteen thousand, eight hundred thirty-one".