66520433 has 8 divisors (see below), whose sum is σ = 76939968. Its totient is φ = 56330064.

The previous prime is 66520427. The next prime is 66520471. The reversal of 66520433 is 33402566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66520433 - 2⁴ = 66520417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66520396 and 66520405.

It is not an unprimeable number, because it can be changed into a prime (66520423) 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, 56666 + ... + 57827.

It is an arithmetic number, because the mean of its divisors is an integer number (9617496).

Almost surely, 2^66520433 is an apocalyptic number.

It is an amenable number.

66520433 is a deficient number, since it is larger than the sum of its proper divisors (10419535).

66520433 is a wasteful number, since it uses less digits than its factorization.

66520433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114583.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 66520433 is about 8156.0059465403. The cubic root of 66520433 is about 405.1834417680.

Adding to 66520433 its reverse (33402566), we get a palindrome (99922999).

The spelling of 66520433 in words is "sixty-six million, five hundred twenty thousand, four hundred thirty-three".