66361633 has 4 divisors (see below), whose sum is σ = 71466388. Its totient is φ = 61256880.

The previous prime is 66361621. The next prime is 66361643. The reversal of 66361633 is 33616366.

66361633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 21095649 + 45265984 = 4593^2 + 6728^2 .

It is a cyclic number.

It is not a de Polignac number, because 66361633 - 2⁹ = 66361121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66361643) 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 3 ways as a sum of consecutive naturals, for example, 2552358 + ... + 2552383.

It is an arithmetic number, because the mean of its divisors is an integer number (17866597).

Almost surely, 2^66361633 is an apocalyptic number.

It is an amenable number.

66361633 is a deficient number, since it is larger than the sum of its proper divisors (5104755).

66361633 is a wasteful number, since it uses less digits than its factorization.

66361633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104754.

The product of its digits is 34992, while the sum is 34.

The square root of 66361633 is about 8146.2649723662. The cubic root of 66361633 is about 404.8607619717.

Adding to 66361633 its reverse (33616366), we get a palindrome (99977999).

The spelling of 66361633 in words is "sixty-six million, three hundred sixty-one thousand, six hundred thirty-three".