66223145 has 8 divisors (see below), whose sum is σ = 79668360. Its totient is φ = 52844800.

The previous prime is 66223133. The next prime is 66223163. The reversal of 66223145 is 54132266.

It can be written as a sum of positive squares in 4 ways, for example, as 5180176 + 61042969 = 2276^2 + 7813^2 .

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

It is not a de Polignac number, because 66223145 - 2⁸ = 66222889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14510 + ... + 18519.

It is an arithmetic number, because the mean of its divisors is an integer number (9958545).

Almost surely, 2^66223145 is an apocalyptic number.

It is an amenable number.

66223145 is a deficient number, since it is larger than the sum of its proper divisors (13445215).

66223145 is a wasteful number, since it uses less digits than its factorization.

66223145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33435.

The product of its digits is 8640, while the sum is 29.

The square root of 66223145 is about 8137.7604413008. The cubic root of 66223145 is about 404.5789354484.

The spelling of 66223145 in words is "sixty-six million, two hundred twenty-three thousand, one hundred forty-five".