6649244769 has 16 divisors (see below), whose sum is σ = 9334094400. Its totient is φ = 4198703616.

The previous prime is 6649244761. The next prime is 6649244773. The reversal of 6649244769 is 9674429466.

It is not a de Polignac number, because 6649244769 - 2³ = 6649244761 is a prime.

It is a super-2 number, since 2×6649244769² = 88424911996147726722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (6649244761) 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, 436717 + ... + 451685.

It is an arithmetic number, because the mean of its divisors is an integer number (583380900).

Almost surely, 2^6649244769 is an apocalyptic number.

It is an amenable number.

6649244769 is a deficient number, since it is larger than the sum of its proper divisors (2684849631).

6649244769 is a wasteful number, since it uses less digits than its factorization.

6649244769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22784.

The product of its digits is 15676416, while the sum is 57.

The square root of 6649244769 is about 81542.9014016548. The cubic root of 6649244769 is about 1880.4311642173.

The spelling of 6649244769 in words is "six billion, six hundred forty-nine million, two hundred forty-four thousand, seven hundred sixty-nine".