664041213 has 16 divisors (see below), whose sum is σ = 1073198400. Its totient is φ = 402449040.

The previous prime is 664041179. The next prime is 664041229. The reversal of 664041213 is 312140466.

664041213 is a `hidden beast` number, since 6 + 640 + 4 + 1 + 2 + 13 = 666.

It is not a de Polignac number, because 664041213 - 2¹³ = 664033021 is a prime.

It is a super-2 number, since 2×664041213² = 881901465125022738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664041263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1117618 + ... + 1118211.

It is an arithmetic number, because the mean of its divisors is an integer number (67074900).

Almost surely, 2^664041213 is an apocalyptic number.

It is an amenable number.

664041213 is a deficient number, since it is larger than the sum of its proper divisors (409157187).

664041213 is a wasteful number, since it uses less digits than its factorization.

664041213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235849 (or 2235843 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 664041213 is about 25768.9971283323. The cubic root of 664041213 is about 872.4321835178.

Adding to 664041213 its reverse (312140466), we get a palindrome (976181679).

The spelling of 664041213 in words is "six hundred sixty-four million, forty-one thousand, two hundred thirteen".