66223733 has 8 divisors (see below), whose sum is σ = 70179480. Its totient is φ = 62379520.

The previous prime is 66223723. The next prime is 66223771. The reversal of 66223733 is 33732266.

It can be written as a sum of positive squares in 4 ways, for example, as 15856324 + 50367409 = 3982^2 + 7097^2 .

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 66223733 - 2¹⁸ = 65961589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66223733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223723) 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, 26660 + ... + 29037.

It is an arithmetic number, because the mean of its divisors is an integer number (8772435).

Almost surely, 2^66223733 is an apocalyptic number.

It is an amenable number.

66223733 is a deficient number, since it is larger than the sum of its proper divisors (3955747).

66223733 is a wasteful number, since it uses less digits than its factorization.

66223733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55767.

The product of its digits is 27216, while the sum is 32.

The square root of 66223733 is about 8137.7965690966. The cubic root of 66223733 is about 404.5801328733.

Adding to 66223733 its reverse (33732266), we get a palindrome (99955999).

The spelling of 66223733 in words is "sixty-six million, two hundred twenty-three thousand, seven hundred thirty-three".