6644789907001 has 9 divisors (see below), whose sum is σ = 7012974002853. Its totient is φ = 6295017722940.

The previous prime is 6644789906983. The next prime is 6644789907029. The reversal of 6644789907001 is 1007099874466.

The square root of 6644789907001 is 2577749.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-6644789907001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6644789905001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 48909396 + ... + 49045066.

Almost surely, 2^{6644789907001} is an apocalyptic number.

6644789907001 is the 2577749-th square number.

6644789907001 is the 1288875-th centered octagonal number.

It is an amenable number.

6644789907001 is a deficient number, since it is larger than the sum of its proper divisors (368184095852).

6644789907001 is an frugal number, since it uses more digits than its factorization.

6644789907001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271380 (or 135690 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 61.

The spelling of 6644789907001 in words is "six trillion, six hundred forty-four billion, seven hundred eighty-nine million, nine hundred seven thousand, one".