66316633 has 4 divisors (see below), whose sum is σ = 66755968. Its totient is φ = 65877300.

The previous prime is 66316603. The next prime is 66316637. The reversal of 66316633 is 33661366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66316633 - 2²¹ = 64219481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66316637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219441 + ... + 219742.

It is an arithmetic number, because the mean of its divisors is an integer number (16688992).

Almost surely, 2^66316633 is an apocalyptic number.

It is an amenable number.

66316633 is a deficient number, since it is larger than the sum of its proper divisors (439335).

66316633 is a wasteful number, since it uses less digits than its factorization.

66316633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439334.

The product of its digits is 34992, while the sum is 34.

The square root of 66316633 is about 8143.5025019951. The cubic root of 66316633 is about 404.7692288921.

Adding to 66316633 its reverse (33661366), we get a palindrome (99977999).

The spelling of 66316633 in words is "sixty-six million, three hundred sixteen thousand, six hundred thirty-three".