6644466644 has 6 divisors (see below), whose sum is σ = 11627816634. Its totient is φ = 3322233320.

The previous prime is 6644466607. The next prime is 6644466701. The reversal of 6644466644 is 4466644466.

It can be written as a sum of positive squares in only one way, i.e., 6183935044 + 460531600 = 78638^2 + 21460^2 .

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6644466592 and 6644466601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830558327 + ... + 830558334.

It is an arithmetic number, because the mean of its divisors is an integer number (1937969439).

Almost surely, 2^6644466644 is an apocalyptic number.

It is an amenable number.

6644466644 is a deficient number, since it is larger than the sum of its proper divisors (4983349990).

6644466644 is a wasteful number, since it uses less digits than its factorization.

6644466644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661116665 (or 1661116663 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 50.

The square root of 6644466644 is about 81513.5979085698. The cubic root of 6644466644 is about 1879.9806324397.

The spelling of 6644466644 in words is "six billion, six hundred forty-four million, four hundred sixty-six thousand, six hundred forty-four".