6647227465 has 4 divisors (see below), whose sum is σ = 7976672964. Its totient is φ = 5317781968.

The previous prime is 6647227399. The next prime is 6647227469. The reversal of 6647227465 is 5647227466.

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 4864783504 + 1782443961 = 69748^2 + 42219^2 .

It is a cyclic number.

It is not a de Polignac number, because 6647227465 - 2³¹ = 4499743817 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6647227469) 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, 664722742 + ... + 664722751.

It is an arithmetic number, because the mean of its divisors is an integer number (1994168241).

Almost surely, 2^6647227465 is an apocalyptic number.

It is an amenable number.

6647227465 is a deficient number, since it is larger than the sum of its proper divisors (1329445499).

6647227465 is a wasteful number, since it uses less digits than its factorization.

6647227465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329445498.

The product of its digits is 3386880, while the sum is 49.

The square root of 6647227465 is about 81530.5308764760. The cubic root of 6647227465 is about 1880.2409779566.

Subtracting from 6647227465 its reverse (5647227466), we obtain a palindrome (999999999).

The spelling of 6647227465 in words is "six billion, six hundred forty-seven million, two hundred twenty-seven thousand, four hundred sixty-five".