6649741690 has 8 divisors (see below), whose sum is σ = 11969535060. Its totient is φ = 2659896672.

The previous prime is 6649741687. The next prime is 6649741691. The reversal of 6649741690 is 961479466.

It can be written as a sum of positive squares in 2 ways, for example, as 6623843769 + 25897921 = 81387^2 + 5089^2 .

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

It is a super-2 number, since 2×6649741690² = 88438129087448112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6649741691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332487075 + ... + 332487094.

Almost surely, 2^6649741690 is an apocalyptic number.

6649741690 is a deficient number, since it is larger than the sum of its proper divisors (5319793370).

6649741690 is a wasteful number, since it uses less digits than its factorization.

6649741690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664974176.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 6649741690 is about 81545.9483358922. The cubic root of 6649741690 is about 1880.4780067531.

The spelling of 6649741690 in words is "six billion, six hundred forty-nine million, seven hundred forty-one thousand, six hundred ninety".