6645219034 has 4 divisors (see below), whose sum is σ = 9967828554. Its totient is φ = 3322609516.

The previous prime is 6645219017. The next prime is 6645219067. The reversal of 6645219034 is 4309125466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6153931809 + 491287225 = 78447^2 + 22165^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661304757 + ... + 1661304760.

Almost surely, 2^6645219034 is an apocalyptic number.

6645219034 is a deficient number, since it is larger than the sum of its proper divisors (3322609520).

6645219034 is a wasteful number, since it uses less digits than its factorization.

6645219034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322609519.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 6645219034 is about 81518.2128974869. The cubic root of 6645219034 is about 1880.0515899906.

The spelling of 6645219034 in words is "six billion, six hundred forty-five million, two hundred nineteen thousand, thirty-four".