6626991648 has 48 divisors (see below), whose sum is σ = 17431406496. Its totient is φ = 2204482560.

The previous prime is 6626991619. The next prime is 6626991649. The reversal of 6626991648 is 8461996266.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (6626991649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23161 + ... + 117432.

It is an arithmetic number, because the mean of its divisors is an integer number (363154302).

Almost surely, 2^6626991648 is an apocalyptic number.

It is an amenable number.

6626991648 is an abundant number, since it is smaller than the sum of its proper divisors (10804414848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6626991648 is a wasteful number, since it uses less digits than its factorization.

6626991648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141097 (or 141089 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 57.

The square root of 6626991648 is about 81406.3366575355. The cubic root of 6626991648 is about 1878.3310645182.

The spelling of 6626991648 in words is "six billion, six hundred twenty-six million, nine hundred ninety-one thousand, six hundred forty-eight".