6649649643 has 32 divisors (see below), whose sum is σ = 11061761536. Its totient is φ = 3459449088.

The previous prime is 6649649593. The next prime is 6649649651. The reversal of 6649649643 is 3469469466.

It is not a de Polignac number, because 6649649643 - 2⁶ = 6649649579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6649641643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146905 + ... + 186762.

It is an arithmetic number, because the mean of its divisors is an integer number (345680048).

Almost surely, 2^6649649643 is an apocalyptic number.

6649649643 is a deficient number, since it is larger than the sum of its proper divisors (4412111893).

6649649643 is a wasteful number, since it uses less digits than its factorization.

6649649643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333763.

The product of its digits is 20155392, while the sum is 57.

The square root of 6649649643 is about 81545.3839466098. The cubic root of 6649649643 is about 1880.4693300673.

The spelling of 6649649643 in words is "six billion, six hundred forty-nine million, six hundred forty-nine thousand, six hundred forty-three".