66284425 has 6 divisors (see below), whose sum is σ = 82192718. Its totient is φ = 53027520.

The previous prime is 66284423. The next prime is 66284437. The reversal of 66284425 is 52448266.

It can be written as a sum of positive squares in 3 ways, for example, as 2108304 + 64176121 = 1452^2 + 8011^2 .

It is not a de Polignac number, because 66284425 - 2¹ = 66284423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66284423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1325664 + ... + 1325713.

Almost surely, 2^66284425 is an apocalyptic number.

It is an amenable number.

66284425 is a deficient number, since it is larger than the sum of its proper divisors (15908293).

66284425 is a wasteful number, since it uses less digits than its factorization.

66284425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651387 (or 2651382 counting only the distinct ones).

The product of its digits is 92160, while the sum is 37.

The square root of 66284425 is about 8141.5247343480. The cubic root of 66284425 is about 404.7036901887.

The spelling of 66284425 in words is "sixty-six million, two hundred eighty-four thousand, four hundred twenty-five".