2644489965 has 16 divisors (see below), whose sum is σ = 4556659968. Its totient is φ = 1301902656.

The previous prime is 2644489963. The next prime is 2644489993. The reversal of 2644489965 is 5699844462.

It is not a de Polignac number, because 2644489965 - 2¹ = 2644489963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644489963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6780549 + ... + 6780938.

It is an arithmetic number, because the mean of its divisors is an integer number (284791248).

Almost surely, 2^2644489965 is an apocalyptic number.

It is an amenable number.

2644489965 is a deficient number, since it is larger than the sum of its proper divisors (1912170003).

2644489965 is a wasteful number, since it uses less digits than its factorization.

2644489965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13561508.

The product of its digits is 14929920, while the sum is 57.

The square root of 2644489965 is about 51424.6046654712. The cubic root of 2644489965 is about 1382.8677264330.

The spelling of 2644489965 in words is "two billion, six hundred forty-four million, four hundred eighty-nine thousand, nine hundred sixty-five".