6649244791 has 4 divisors (see below), whose sum is σ = 7599136912. Its totient is φ = 5699352672.

The previous prime is 6649244773. The next prime is 6649244821. The reversal of 6649244791 is 1974429466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1974429466 = 2 ⋅987214733.

It is a cyclic number.

It is not a de Polignac number, because 6649244791 - 2⁹ = 6649244279 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 474946050 + ... + 474946063.

It is an arithmetic number, because the mean of its divisors is an integer number (1899784228).

Almost surely, 2^6649244791 is an apocalyptic number.

6649244791 is a deficient number, since it is larger than the sum of its proper divisors (949892121).

6649244791 is an equidigital number, since it uses as much as digits as its factorization.

6649244791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949892120.

The product of its digits is 2612736, while the sum is 52.

The square root of 6649244791 is about 81542.9015365531. The cubic root of 6649244791 is about 1880.4311662912.

The spelling of 6649244791 in words is "six billion, six hundred forty-nine million, two hundred forty-four thousand, seven hundred ninety-one".