66321410 has 8 divisors (see below), whose sum is σ = 119378556. Its totient is φ = 26528560.

The previous prime is 66321383. The next prime is 66321421. The reversal of 66321410 is 1412366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65593801 + 727609 = 8099^2 + 853^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3316061 + ... + 3316080.

Almost surely, 2^66321410 is an apocalyptic number.

66321410 is a deficient number, since it is larger than the sum of its proper divisors (53057146).

66321410 is a wasteful number, since it uses less digits than its factorization.

66321410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632148.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 66321410 is about 8143.7957980293. The cubic root of 66321410 is about 404.7789476012.

Adding to 66321410 its reverse (1412366), we get a palindrome (67733776).

The spelling of 66321410 in words is "sixty-six million, three hundred twenty-one thousand, four hundred ten".