66533320 has 32 divisors (see below), whose sum is σ = 171086400. Its totient is φ = 22811328.

The previous prime is 66533309. The next prime is 66533321. The reversal of 66533320 is 2333566.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66533321) 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 7 ways as a sum of consecutive naturals, for example, 118530 + ... + 119089.

It is an arithmetic number, because the mean of its divisors is an integer number (5346450).

Almost surely, 2^66533320 is an apocalyptic number.

It is an amenable number.

66533320 is an abundant number, since it is smaller than the sum of its proper divisors (104553080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66533320 is a wasteful number, since it uses less digits than its factorization.

66533320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237637 (or 237633 counting only the distinct ones).

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

The square root of 66533320 is about 8156.7959395831. The cubic root of 66533320 is about 405.2096054675.

Adding to 66533320 its reverse (2333566), we get a palindrome (68866886).

The spelling of 66533320 in words is "sixty-six million, five hundred thirty-three thousand, three hundred twenty".