6649823641 has 8 divisors (see below), whose sum is σ = 6944385600. Its totient is φ = 6355714992.

The previous prime is 6649823629. The next prime is 6649823669. The reversal of 6649823641 is 1463289466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6649823641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6649823611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83166 + ... + 142183.

It is an arithmetic number, because the mean of its divisors is an integer number (868048200).

Almost surely, 2^6649823641 is an apocalyptic number.

It is an amenable number.

6649823641 is a deficient number, since it is larger than the sum of its proper divisors (294561959).

6649823641 is a wasteful number, since it uses less digits than its factorization.

6649823641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226655.

The product of its digits is 1492992, while the sum is 49.

The square root of 6649823641 is about 81546.4508179234. The cubic root of 6649823641 is about 1880.4857316858.

The spelling of 6649823641 in words is "six billion, six hundred forty-nine million, eight hundred twenty-three thousand, six hundred forty-one".