664416831 has 32 divisors (see below), whose sum is σ = 1042771968. Its totient is φ = 372395520.

The previous prime is 664416827. The next prime is 664416853. The reversal of 664416831 is 138614466.

It is not a de Polignac number, because 664416831 - 2² = 664416827 is a prime.

It is a super-2 number, since 2×664416831² = 882899450632165122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 664416831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664416811) 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 31 ways as a sum of consecutive naturals, for example, 4390 + ... + 36716.

It is an arithmetic number, because the mean of its divisors is an integer number (32586624).

Almost surely, 2^664416831 is an apocalyptic number.

664416831 is a deficient number, since it is larger than the sum of its proper divisors (378355137).

664416831 is a wasteful number, since it uses less digits than its factorization.

664416831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32391.

The product of its digits is 82944, while the sum is 39.

The square root of 664416831 is about 25776.2842745032. The cubic root of 664416831 is about 872.5966509516.

The spelling of 664416831 in words is "six hundred sixty-four million, four hundred sixteen thousand, eight hundred thirty-one".