66520333 has 4 divisors (see below), whose sum is σ = 72567648. Its totient is φ = 60473020.

The previous prime is 66520331. The next prime is 66520351. The reversal of 66520333 is 33302566.

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 66520333 - 2¹ = 66520331 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66520331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3023641 + ... + 3023662.

It is an arithmetic number, because the mean of its divisors is an integer number (18141912).

Almost surely, 2^66520333 is an apocalyptic number.

It is an amenable number.

66520333 is a deficient number, since it is larger than the sum of its proper divisors (6047315).

66520333 is a wasteful number, since it uses less digits than its factorization.

66520333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6047314.

The product of its (nonzero) digits is 9720, while the sum is 28.

The square root of 66520333 is about 8155.9998160863. Note that the first 3 decimals coincide. The cubic root of 66520333 is about 405.1832387308.

Adding to 66520333 its reverse (33302566), we get a palindrome (99822899).

The spelling of 66520333 in words is "sixty-six million, five hundred twenty thousand, three hundred thirty-three".