66424213 has 8 divisors (see below), whose sum is σ = 68416568. Its totient is φ = 64442304.

The previous prime is 66424201. The next prime is 66424229. The reversal of 66424213 is 31242466.

It can be written as a sum of positive squares in 4 ways, for example, as 32341969 + 34082244 = 5687^2 + 5838^2 .

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 66424213 - 2¹⁷ = 66293141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66424283) 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, 11395 + ... + 16207.

It is an arithmetic number, because the mean of its divisors is an integer number (8552071).

Almost surely, 2^66424213 is an apocalyptic number.

It is an amenable number.

66424213 is a deficient number, since it is larger than the sum of its proper divisors (1992355).

66424213 is a wasteful number, since it uses less digits than its factorization.

66424213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223.

The product of its digits is 6912, while the sum is 28.

The square root of 66424213 is about 8150.1050913470. The cubic root of 66424213 is about 404.9879852149.

Adding to 66424213 its reverse (31242466), we get a palindrome (97666679).

The spelling of 66424213 in words is "sixty-six million, four hundred twenty-four thousand, two hundred thirteen".