66351633 has 4 divisors (see below), whose sum is σ = 88468848. Its totient is φ = 44234420.

The previous prime is 66351569. The next prime is 66351683. The reversal of 66351633 is 33615366.

66351633 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66351633 - 2⁶ = 66351569 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66351594 and 66351603.

It is not an unprimeable number, because it can be changed into a prime (66351683) 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, 11058603 + ... + 11058608.

It is an arithmetic number, because the mean of its divisors is an integer number (22117212).

Almost surely, 2^66351633 is an apocalyptic number.

It is an amenable number.

66351633 is a deficient number, since it is larger than the sum of its proper divisors (22117215).

66351633 is a wasteful number, since it uses less digits than its factorization.

66351633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22117214.

The product of its digits is 29160, while the sum is 33.

The square root of 66351633 is about 8145.6511710237. The cubic root of 66351633 is about 404.8404248642.

Adding to 66351633 its reverse (33615366), we get a palindrome (99966999).

The spelling of 66351633 in words is "sixty-six million, three hundred fifty-one thousand, six hundred thirty-three".