66223453 has 4 divisors (see below), whose sum is σ = 66376828. Its totient is φ = 66070080.

The previous prime is 66223441. The next prime is 66223489. The reversal of 66223453 is 35432266.

It is a happy number.

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 39463524 + 26759929 = 6282^2 + 5173^2 .

It is a cyclic number.

It is not a de Polignac number, because 66223453 - 2⁹ = 66222941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76038 + ... + 76903.

It is an arithmetic number, because the mean of its divisors is an integer number (16594207).

Almost surely, 2^66223453 is an apocalyptic number.

It is an amenable number.

66223453 is a deficient number, since it is larger than the sum of its proper divisors (153375).

66223453 is a wasteful number, since it uses less digits than its factorization.

66223453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153374.

The product of its digits is 25920, while the sum is 31.

The square root of 66223453 is about 8137.7793654043. The cubic root of 66223453 is about 404.5795626718.

The spelling of 66223453 in words is "sixty-six million, two hundred twenty-three thousand, four hundred fifty-three".