66520033 has 4 divisors (see below), whose sum is σ = 66544900. Its totient is φ = 66495168.

The previous prime is 66520001. The next prime is 66520039. The reversal of 66520033 is 33002566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24373969 + 42146064 = 4937^2 + 6492^2 .

It is a cyclic number.

It is not a de Polignac number, because 66520033 - 2⁵ = 66520001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66520039) 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, 7860 + ... + 13957.

It is an arithmetic number, because the mean of its divisors is an integer number (16636225).

Almost surely, 2^66520033 is an apocalyptic number.

It is an amenable number.

66520033 is a deficient number, since it is larger than the sum of its proper divisors (24867).

66520033 is a wasteful number, since it uses less digits than its factorization.

66520033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24866.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 66520033 is about 8155.9814246968. The cubic root of 66520033 is about 405.1826296181.

Adding to 66520033 its reverse (33002566), we get a palindrome (99522599).

The spelling of 66520033 in words is "sixty-six million, five hundred twenty thousand, thirty-three".