6644629369 has 6 divisors (see below), whose sum is σ = 7729466874. Its totient is φ = 5695396560.

The previous prime is 6644629361. The next prime is 6644629393. The reversal of 6644629369 is 9639264466.

It can be written as a sum of positive squares in only one way, i.e., 3780774144 + 2863855225 = 61488^2 + 53515^2 .

It is not a de Polignac number, because 6644629369 - 2³ = 6644629361 is a prime.

It is a super-2 number, since 2×6644629369² = 88302198902754676322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644629361) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 67802292 + ... + 67802389.

It is an arithmetic number, because the mean of its divisors is an integer number (1288244479).

Almost surely, 2^6644629369 is an apocalyptic number.

It is an amenable number.

6644629369 is a deficient number, since it is larger than the sum of its proper divisors (1084837505).

6644629369 is a wasteful number, since it uses less digits than its factorization.

6644629369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135604695 (or 135604688 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 55.

The square root of 6644629369 is about 81514.5960488059. The cubic root of 6644629369 is about 1879.9959794127.

The spelling of 6644629369 in words is "six billion, six hundred forty-four million, six hundred twenty-nine thousand, three hundred sixty-nine".