6648771908 has 6 divisors (see below), whose sum is σ = 11635350846. Its totient is φ = 3324385952.

The previous prime is 6648771901. The next prime is 6648771953. The reversal of 6648771908 is 8091778466.

It can be written as a sum of positive squares in only one way, i.e., 4132946944 + 2515824964 = 64288^2 + 50158^2 .

It is not an unprimeable number, because it can be changed into a prime (6648771901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831096485 + ... + 831096492.

It is an arithmetic number, because the mean of its divisors is an integer number (1939225141).

Almost surely, 2^6648771908 is an apocalyptic number.

It is an amenable number.

6648771908 is a deficient number, since it is larger than the sum of its proper divisors (4986578938).

6648771908 is a wasteful number, since it uses less digits than its factorization.

6648771908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662192981 (or 1662192979 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 56.

The square root of 6648771908 is about 81540.0018886436. The cubic root of 6648771908 is about 1880.3865875438.

The spelling of 6648771908 in words is "six billion, six hundred forty-eight million, seven hundred seventy-one thousand, nine hundred eight".