66412409 has 8 divisors (see below), whose sum is σ = 76056000. Its totient is φ = 56807856.

The previous prime is 66412397. The next prime is 66412433. The reversal of 66412409 is 90421466.

It is a happy number.

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

It is not a de Polignac number, because 66412409 - 2¹² = 66408313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66412499) 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 7 ways as a sum of consecutive naturals, for example, 6014 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (9507000).

Almost surely, 2^66412409 is an apocalyptic number.

It is an amenable number.

66412409 is a deficient number, since it is larger than the sum of its proper divisors (9643591).

66412409 is a wasteful number, since it uses less digits than its factorization.

66412409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19519.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66412409 is about 8149.3808967307. The cubic root of 66412409 is about 404.9639941572.

The spelling of 66412409 in words is "sixty-six million, four hundred twelve thousand, four hundred nine".