66213633 has 8 divisors (see below), whose sum is σ = 89110368. Its totient is φ = 43729664.

The previous prime is 66213629. The next prime is 66213643. The reversal of 66213633 is 33631266.

66213633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 66213633 - 2² = 66213629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66213633.

It is not an unprimeable number, because it can be changed into a prime (66213643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102816 + ... + 103457.

It is an arithmetic number, because the mean of its divisors is an integer number (11138796).

Almost surely, 2^66213633 is an apocalyptic number.

It is an amenable number.

66213633 is a deficient number, since it is larger than the sum of its proper divisors (22896735).

66213633 is a wasteful number, since it uses less digits than its factorization.

66213633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206383.

The product of its digits is 11664, while the sum is 30.

The square root of 66213633 is about 8137.1759843326. The cubic root of 66213633 is about 404.5595638773.

Adding to 66213633 its reverse (33631266), we get a palindrome (99844899).

The spelling of 66213633 in words is "sixty-six million, two hundred thirteen thousand, six hundred thirty-three".