66412785 has 8 divisors (see below), whose sum is σ = 106260480. Its totient is φ = 35420144.

The previous prime is 66412783. The next prime is 66412789. The reversal of 66412785 is 58721466.

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 66412785 - 2¹ = 66412783 is a prime.

It is a super-2 number, since 2×66412785² = 8821316022912450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66412783) 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, 2213745 + ... + 2213774.

It is an arithmetic number, because the mean of its divisors is an integer number (13282560).

Almost surely, 2^66412785 is an apocalyptic number.

It is an amenable number.

66412785 is a deficient number, since it is larger than the sum of its proper divisors (39847695).

66412785 is a wasteful number, since it uses less digits than its factorization.

66412785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427527.

The product of its digits is 80640, while the sum is 39.

The square root of 66412785 is about 8149.4039659352. The cubic root of 66412785 is about 404.9647584028.

The spelling of 66412785 in words is "sixty-six million, four hundred twelve thousand, seven hundred eighty-five".