6644397147 has 128 divisors (see below), whose sum is σ = 10741248000. Its totient is φ = 3622993920.

The previous prime is 6644397127. The next prime is 6644397163. The reversal of 6644397147 is 7417934466.

It is not a de Polignac number, because 6644397147 - 2¹⁰ = 6644396123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 6644397147.

It is not an unprimeable number, because it can be changed into a prime (6644397127) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 84106254 + ... + 84106332.

It is an arithmetic number, because the mean of its divisors is an integer number (83916000).

Almost surely, 2^6644397147 is an apocalyptic number.

6644397147 is a deficient number, since it is larger than the sum of its proper divisors (4096850853).

6644397147 is a wasteful number, since it uses less digits than its factorization.

6644397147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261.

The product of its digits is 3048192, while the sum is 51.

The square root of 6644397147 is about 81513.1716166167. The cubic root of 6644397147 is about 1879.9740779397.

The spelling of 6644397147 in words is "six billion, six hundred forty-four million, three hundred ninety-seven thousand, one hundred forty-seven".