6648506779 has 4 divisors (see below), whose sum is σ = 6717048184. Its totient is φ = 6579965376.

The previous prime is 6648506773. The next prime is 6648506797. The reversal of 6648506779 is 9776058466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6648506779 - 2²³ = 6640118171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6648506773) 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, 34270557 + ... + 34270750.

It is an arithmetic number, because the mean of its divisors is an integer number (1679262046).

Almost surely, 2^6648506779 is an apocalyptic number.

6648506779 is a deficient number, since it is larger than the sum of its proper divisors (68541405).

6648506779 is an equidigital number, since it uses as much as digits as its factorization.

6648506779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68541404.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The square root of 6648506779 is about 81538.3761121105. The cubic root of 6648506779 is about 1880.3615928707.

The spelling of 6648506779 in words is "six billion, six hundred forty-eight million, five hundred six thousand, seven hundred seventy-nine".